✨ Add support for Pydantic models for parameters using `Query`, `Cookie`, `Header` (#12199)

docs/en/docs/tutorial/cookie-param-models.md

@@ -0,0 +1,154 @@
+# Cookie Parameter Models
+
+If you have a group of **cookies** that are related, you can create a **Pydantic model** to declare them. 🍪
+
+This would allow you to **re-use the model** in **multiple places** and also to declare validations and metadata for all the parameters at once. 😎
+
+/// note
+
+This is supported since FastAPI version `0.115.0`. 🤓
+
+///
+
+/// tip
+
+This same technique applies to `Query`, `Cookie`, and `Header`. 😎
+
+///
+
+## Cookies with a Pydantic Model
+
+Declare the **cookie** parameters that you need in a **Pydantic model**, and then declare the parameter as `Cookie`:
+
+//// tab | Python 3.10+
+
+```Python hl_lines="9-12  16"
+{!> ../../../docs_src/cookie_param_models/tutorial001_an_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+
+
+```Python hl_lines="9-12  16"
+{!> ../../../docs_src/cookie_param_models/tutorial001_an_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+
+
+```Python hl_lines="10-13  17"
+{!> ../../../docs_src/cookie_param_models/tutorial001_an.py!}
+```
+
+////
+
+//// tab | Python 3.10+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="7-10  14"
+{!> ../../../docs_src/cookie_param_models/tutorial001_py310.py!}
+```
+
+////
+
+//// tab | Python 3.8+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="9-12  16"
+{!> ../../../docs_src/cookie_param_models/tutorial001.py!}
+```
+
+////
+
+**FastAPI** will **extract** the data for **each field** from the **cookies** received in the request and give you the Pydantic model you defined.
+
+## Check the Docs
+
+You can see the defined cookies in the docs UI at `/docs`:
+
+<div class="screenshot">
+<img src="/img/tutorial/cookie-param-models/image01.png">
+</div>
+
+/// info
+
+Have in mind that, as **browsers handle cookies** in special ways and behind the scenes, they **don't** easily allow **JavaScript** to touch them.
+
+If you go to the **API docs UI** at `/docs` you will be able to see the **documentation** for cookies for your *path operations*.
+
+But even if you **fill the data** and click "Execute", because the docs UI works with **JavaScript**, the cookies won't be sent, and you will see an **error** message as if you didn't write any values.
+
+///
+
+## Forbid Extra Cookies
+
+In some special use cases (probably not very common), you might want to **restrict** the cookies that you want to receive.
+
+Your API now has the power to control its own <abbr title="This is a joke, just in case. It has nothing to do with cookie consents, but it's funny that even the API can now reject the poor cookies. Have a cookie. 🍪">cookie consent</abbr>. 🤪🍪
+
+You can use Pydantic's model configuration to `forbid` any `extra` fields:
+
+//// tab | Python 3.9+
+
+```Python hl_lines="10"
+{!> ../../../docs_src/cookie_param_models/tutorial002_an_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+
+
+```Python hl_lines="11"
+{!> ../../../docs_src/cookie_param_models/tutorial002_an.py!}
+```
+
+////
+
+//// tab | Python 3.8+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="10"
+{!> ../../../docs_src/cookie_param_models/tutorial002.py!}
+```
+
+////
+
+If a client tries to send some **extra cookies**, they will receive an **error** response.
+
+Poor cookie banners with all their effort to get your consent for the <abbr title="This is another joke. Don't pay attention to me. Have some coffee for your cookie. ☕">API to reject it</abbr>. 🍪
+
+For example, if the client tries to send a `santa_tracker` cookie with a value of `good-list-please`, the client will receive an **error** response telling them that the `santa_tracker` <abbr title="Santa disapproves the lack of cookies. 🎅 Okay, no more cookie jokes.">cookie is not allowed</abbr>:
+
+```json
+{
+    "detail": [
+        {
+            "type": "extra_forbidden",
+            "loc": ["cookie", "santa_tracker"],
+            "msg": "Extra inputs are not permitted",
+            "input": "good-list-please",
+        }
+    ]
+}
+```
+
+## Summary
+
+You can use **Pydantic models** to declare <abbr title="Have a last cookie before you go. 🍪">**cookies**</abbr> in **FastAPI**. 😎

docs/en/docs/tutorial/header-param-models.md

@@ -0,0 +1,184 @@
+# Header Parameter Models
+
+If you have a group of related **header parameters**, you can create a **Pydantic model** to declare them.
+
+This would allow you to **re-use the model** in **multiple places** and also to declare validations and metadata for all the parameters at once. 😎
+
+/// note
+
+This is supported since FastAPI version `0.115.0`. 🤓
+
+///
+
+## Header Parameters with a Pydantic Model
+
+Declare the **header parameters** that you need in a **Pydantic model**, and then declare the parameter as `Header`:
+
+//// tab | Python 3.10+
+
+```Python hl_lines="9-14  18"
+{!> ../../../docs_src/header_param_models/tutorial001_an_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+
+
+```Python hl_lines="9-14  18"
+{!> ../../../docs_src/header_param_models/tutorial001_an_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+
+
+```Python hl_lines="10-15  19"
+{!> ../../../docs_src/header_param_models/tutorial001_an.py!}
+```
+
+////
+
+//// tab | Python 3.10+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="7-12  16"
+{!> ../../../docs_src/header_param_models/tutorial001_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="9-14  18"
+{!> ../../../docs_src/header_param_models/tutorial001_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="7-12  16"
+{!> ../../../docs_src/header_param_models/tutorial001_py310.py!}
+```
+
+////
+
+**FastAPI** will **extract** the data for **each field** from the **headers** in the request and give you the Pydantic model you defined.
+
+## Check the Docs
+
+You can see the required headers in the docs UI at `/docs`:
+
+<div class="screenshot">
+<img src="/img/tutorial/header-param-models/image01.png">
+</div>
+
+## Forbid Extra Headers
+
+In some special use cases (probably not very common), you might want to **restrict** the headers that you want to receive.
+
+You can use Pydantic's model configuration to `forbid` any `extra` fields:
+
+//// tab | Python 3.10+
+
+```Python hl_lines="10"
+{!> ../../../docs_src/header_param_models/tutorial002_an_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+
+
+```Python hl_lines="10"
+{!> ../../../docs_src/header_param_models/tutorial002_an_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+
+
+```Python hl_lines="11"
+{!> ../../../docs_src/header_param_models/tutorial002_an.py!}
+```
+
+////
+
+//// tab | Python 3.10+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="8"
+{!> ../../../docs_src/header_param_models/tutorial002_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="10"
+{!> ../../../docs_src/header_param_models/tutorial002_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="10"
+{!> ../../../docs_src/header_param_models/tutorial002.py!}
+```
+
+////
+
+If a client tries to send some **extra headers**, they will receive an **error** response.
+
+For example, if the client tries to send a `tool` header with a value of `plumbus`, they will receive an **error** response telling them that the header parameter `tool` is not allowed:
+
+```json
+{
+    "detail": [
+        {
+            "type": "extra_forbidden",
+            "loc": ["header", "tool"],
+            "msg": "Extra inputs are not permitted",
+            "input": "plumbus",
+        }
+    ]
+}
+```
+
+## Summary
+
+You can use **Pydantic models** to declare **headers** in **FastAPI**. 😎

docs/en/docs/tutorial/query-param-models.md

@@ -0,0 +1,196 @@
+# Query Parameter Models
+
+If you have a group of **query parameters** that are related, you can create a **Pydantic model** to declare them.
+
+This would allow you to **re-use the model** in **multiple places** and also to declare validations and metadata for all the parameters at once. 😎
+
+/// note
+
+This is supported since FastAPI version `0.115.0`. 🤓
+
+///
+
+## Query Parameters with a Pydantic Model
+
+Declare the **query parameters** that you need in a **Pydantic model**, and then declare the parameter as `Query`:
+
+//// tab | Python 3.10+
+
+```Python hl_lines="9-13  17"
+{!> ../../../docs_src/query_param_models/tutorial001_an_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+
+
+```Python hl_lines="8-12  16"
+{!> ../../../docs_src/query_param_models/tutorial001_an_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+
+
+```Python hl_lines="10-14  18"
+{!> ../../../docs_src/query_param_models/tutorial001_an.py!}
+```
+
+////
+
+//// tab | Python 3.10+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="9-13  17"
+{!> ../../../docs_src/query_param_models/tutorial001_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="8-12 16"
+{!> ../../../docs_src/query_param_models/tutorial001_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="9-13  17"
+{!> ../../../docs_src/query_param_models/tutorial001_py310.py!}
+```
+
+////
+
+**FastAPI** will **extract** the data for **each field** from the **query parameters** in the request and give you the Pydantic model you defined.
+
+## Check the Docs
+
+You can see the query parameters in the docs UI at `/docs`:
+
+<div class="screenshot">
+<img src="/img/tutorial/query-param-models/image01.png">
+</div>
+
+## Forbid Extra Query Parameters
+
+In some special use cases (probably not very common), you might want to **restrict** the query parameters that you want to receive.
+
+You can use Pydantic's model configuration to `forbid` any `extra` fields:
+
+//// tab | Python 3.10+
+
+```Python hl_lines="10"
+{!> ../../../docs_src/query_param_models/tutorial002_an_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+
+
+```Python hl_lines="9"
+{!> ../../../docs_src/query_param_models/tutorial002_an_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+
+
+```Python hl_lines="11"
+{!> ../../../docs_src/query_param_models/tutorial002_an.py!}
+```
+
+////
+
+//// tab | Python 3.10+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="10"
+{!> ../../../docs_src/query_param_models/tutorial002_py310.py!}
+```
+
+////
+
+//// tab | Python 3.9+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="9"
+{!> ../../../docs_src/query_param_models/tutorial002_py39.py!}
+```
+
+////
+
+//// tab | Python 3.8+ non-Annotated
+
+/// tip
+
+Prefer to use the `Annotated` version if possible.
+
+///
+
+```Python hl_lines="11"
+{!> ../../../docs_src/query_param_models/tutorial002.py!}
+```
+
+////
+
+If a client tries to send some **extra** data in the **query parameters**, they will receive an **error** response.
+
+For example, if the client tries to send a `tool` query parameter with a value of `plumbus`, like:
+
+```http
+https://example.com/items/?limit=10&tool=plumbus
+```
+
+They will receive an **error** response telling them that the query parameter `tool` is not allowed:
+
+```json
+{
+    "detail": [
+        {
+            "type": "extra_forbidden",
+            "loc": ["query", "tool"],
+            "msg": "Extra inputs are not permitted",
+            "input": "plumbus"
+        }
+    ]
+}
+```
+
+## Summary
+
+You can use **Pydantic models** to declare **query parameters** in **FastAPI**. 😎
+
+/// tip
+
+Spoiler alert: you can also use Pydantic models to declare cookies and headers, but you will read about that later in the tutorial. 🤫
+
+///

docs/en/mkdocs.yml

@@ -118,6 +118,7 @@ nav:
     - tutorial/body.md
     - tutorial/query-params-str-validations.md
     - tutorial/path-params-numeric-validations.md
+    - tutorial/query-param-models.md
     - tutorial/body-multiple-params.md
     - tutorial/body-fields.md
     - tutorial/body-nested-models.md
@@ -125,6 +126,8 @@ nav:
     - tutorial/extra-data-types.md
     - tutorial/cookie-params.md
     - tutorial/header-params.md
+    - tutorial/cookie-param-models.md
+    - tutorial/header-param-models.md
     - tutorial/response-model.md
     - tutorial/extra-models.md
     - tutorial/response-status-code.md

docs_src/cookie_param_models/tutorial001.py

@@ -0,0 +1,17 @@
+from typing import Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Cookies = Cookie()):
+    return cookies

docs_src/cookie_param_models/tutorial001_an.py

@@ -0,0 +1,18 @@
+from typing import Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial001_an_py310.py

@@ -0,0 +1,17 @@
+from typing import Annotated
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    session_id: str
+    fatebook_tracker: str | None = None
+    googall_tracker: str | None = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial001_an_py39.py

@@ -0,0 +1,17 @@
+from typing import Annotated, Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial001_py310.py

@@ -0,0 +1,15 @@
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    session_id: str
+    fatebook_tracker: str | None = None
+    googall_tracker: str | None = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Cookies = Cookie()):
+    return cookies

docs_src/cookie_param_models/tutorial002.py

@@ -0,0 +1,19 @@
+from typing import Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Cookies = Cookie()):
+    return cookies

docs_src/cookie_param_models/tutorial002_an.py

@@ -0,0 +1,20 @@
+from typing import Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial002_an_py310.py

@@ -0,0 +1,19 @@
+from typing import Annotated
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    session_id: str
+    fatebook_tracker: str | None = None
+    googall_tracker: str | None = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial002_an_py39.py

@@ -0,0 +1,19 @@
+from typing import Annotated, Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial002_pv1.py

@@ -0,0 +1,20 @@
+from typing import Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Cookies = Cookie()):
+    return cookies

docs_src/cookie_param_models/tutorial002_pv1_an.py

@@ -0,0 +1,21 @@
+from typing import Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial002_pv1_an_py310.py

@@ -0,0 +1,20 @@
+from typing import Annotated
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    session_id: str
+    fatebook_tracker: str | None = None
+    googall_tracker: str | None = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial002_pv1_an_py39.py

@@ -0,0 +1,20 @@
+from typing import Annotated, Union
+
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    session_id: str
+    fatebook_tracker: Union[str, None] = None
+    googall_tracker: Union[str, None] = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Annotated[Cookies, Cookie()]):
+    return cookies

docs_src/cookie_param_models/tutorial002_pv1_py310.py

@@ -0,0 +1,18 @@
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    session_id: str
+    fatebook_tracker: str | None = None
+    googall_tracker: str | None = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Cookies = Cookie()):
+    return cookies

docs_src/cookie_param_models/tutorial002_py310.py

@@ -0,0 +1,17 @@
+from fastapi import Cookie, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Cookies(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    session_id: str
+    fatebook_tracker: str | None = None
+    googall_tracker: str | None = None
+
+
+@app.get("/items/")
+async def read_items(cookies: Cookies = Cookie()):
+    return cookies

docs_src/header_param_models/tutorial001.py

@@ -0,0 +1,19 @@
+from typing import List, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/header_param_models/tutorial001_an.py

@@ -0,0 +1,20 @@
+from typing import List, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial001_an_py310.py

@@ -0,0 +1,19 @@
+from typing import Annotated
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: str | None = None
+    traceparent: str | None = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial001_an_py39.py

@@ -0,0 +1,19 @@
+from typing import Annotated, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial001_py310.py

@@ -0,0 +1,17 @@
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: str | None = None
+    traceparent: str | None = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/header_param_models/tutorial001_py39.py

@@ -0,0 +1,19 @@
+from typing import Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/header_param_models/tutorial002.py

@@ -0,0 +1,21 @@
+from typing import List, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/header_param_models/tutorial002_an.py

@@ -0,0 +1,22 @@
+from typing import List, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial002_an_py310.py

@@ -0,0 +1,21 @@
+from typing import Annotated
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    host: str
+    save_data: bool
+    if_modified_since: str | None = None
+    traceparent: str | None = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial002_an_py39.py

@@ -0,0 +1,21 @@
+from typing import Annotated, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial002_pv1.py

@@ -0,0 +1,22 @@
+from typing import List, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/header_param_models/tutorial002_pv1_an.py

@@ -0,0 +1,23 @@
+from typing import List, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial002_pv1_an_py310.py

@@ -0,0 +1,22 @@
+from typing import Annotated
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    host: str
+    save_data: bool
+    if_modified_since: str | None = None
+    traceparent: str | None = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial002_pv1_an_py39.py

@@ -0,0 +1,22 @@
+from typing import Annotated, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: Annotated[CommonHeaders, Header()]):
+    return headers

docs_src/header_param_models/tutorial002_pv1_py310.py

@@ -0,0 +1,20 @@
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    host: str
+    save_data: bool
+    if_modified_since: str | None = None
+    traceparent: str | None = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/header_param_models/tutorial002_pv1_py39.py

@@ -0,0 +1,22 @@
+from typing import Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/header_param_models/tutorial002_py310.py

@@ -0,0 +1,19 @@
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    host: str
+    save_data: bool
+    if_modified_since: str | None = None
+    traceparent: str | None = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/header_param_models/tutorial002_py39.py

@@ -0,0 +1,21 @@
+from typing import Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header()):
+    return headers

docs_src/query_param_models/tutorial001.py

@@ -0,0 +1,19 @@
+from typing import List
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

docs_src/query_param_models/tutorial001_an.py

@@ -0,0 +1,19 @@
+from typing import List
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Annotated, Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial001_an_py310.py

@@ -0,0 +1,18 @@
+from typing import Annotated, Literal
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial001_an_py39.py

@@ -0,0 +1,17 @@
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Annotated, Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial001_py310.py

@@ -0,0 +1,18 @@
+from typing import Literal
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

docs_src/query_param_models/tutorial001_py39.py

@@ -0,0 +1,17 @@
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

docs_src/query_param_models/tutorial002.py

@@ -0,0 +1,21 @@
+from typing import List
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

docs_src/query_param_models/tutorial002_an.py

@@ -0,0 +1,21 @@
+from typing import List
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Annotated, Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial002_an_py310.py

@@ -0,0 +1,20 @@
+from typing import Annotated, Literal
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial002_an_py39.py

@@ -0,0 +1,19 @@
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Annotated, Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial002_pv1.py

@@ -0,0 +1,22 @@
+from typing import List
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

docs_src/query_param_models/tutorial002_pv1_an.py

@@ -0,0 +1,22 @@
+from typing import List
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Annotated, Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial002_pv1_an_py310.py

@@ -0,0 +1,21 @@
+from typing import Annotated, Literal
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial002_pv1_an_py39.py

@@ -0,0 +1,20 @@
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Annotated, Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: Annotated[FilterParams, Query()]):
+    return filter_query

docs_src/query_param_models/tutorial002_pv1_py310.py

@@ -0,0 +1,21 @@
+from typing import Literal
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

docs_src/query_param_models/tutorial002_pv1_py39.py

@@ -0,0 +1,20 @@
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    class Config:
+        extra = "forbid"
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

docs_src/query_param_models/tutorial002_py310.py

@@ -0,0 +1,20 @@
+from typing import Literal
+
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

docs_src/query_param_models/tutorial002_py39.py

@@ -0,0 +1,19 @@
+from fastapi import FastAPI, Query
+from pydantic import BaseModel, Field
+from typing_extensions import Literal
+
+app = FastAPI()
+
+
+class FilterParams(BaseModel):
+    model_config = {"extra": "forbid"}
+
+    limit: int = Field(100, gt=0, le=100)
+    offset: int = Field(0, ge=0)
+    order_by: Literal["created_at", "updated_at"] = "created_at"
+    tags: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(filter_query: FilterParams = Query()):
+    return filter_query

fastapi/dependencies/utils.py

@@ -201,14 +201,23 @@ def get_flat_dependant(
     return flat_dependant
 
 
+def _get_flat_fields_from_params(fields: List[ModelField]) -> List[ModelField]:
+    if not fields:
+        return fields
+    first_field = fields[0]
+    if len(fields) == 1 and lenient_issubclass(first_field.type_, BaseModel):
+        fields_to_extract = get_cached_model_fields(first_field.type_)
+        return fields_to_extract
+    return fields
+
+
 def get_flat_params(dependant: Dependant) -> List[ModelField]:
     flat_dependant = get_flat_dependant(dependant, skip_repeats=True)
-    return (
-        flat_dependant.path_params
-        + flat_dependant.query_params
-        + flat_dependant.header_params
-        + flat_dependant.cookie_params
-    )
+    path_params = _get_flat_fields_from_params(flat_dependant.path_params)
+    query_params = _get_flat_fields_from_params(flat_dependant.query_params)
+    header_params = _get_flat_fields_from_params(flat_dependant.header_params)
+    cookie_params = _get_flat_fields_from_params(flat_dependant.cookie_params)
+    return path_params + query_params + header_params + cookie_params
 
 
 def get_typed_signature(call: Callable[..., Any]) -> inspect.Signature:
@@ -479,7 +488,15 @@ def analyze_param(
                 field=field
             ), "Path params must be of one of the supported types"
         elif isinstance(field_info, params.Query):
-            assert is_scalar_field(field) or is_scalar_sequence_field(field)
+            assert (
+                is_scalar_field(field)
+                or is_scalar_sequence_field(field)
+                or (
+                    lenient_issubclass(field.type_, BaseModel)
+                    # For Pydantic v1
+                    and getattr(field, "shape", 1) == 1
+                )
+            )
 
     return ParamDetails(type_annotation=type_annotation, depends=depends, field=field)
 
@@ -686,11 +703,14 @@ def _validate_value_with_model_field(
         return v_, []
 
 
-def _get_multidict_value(field: ModelField, values: Mapping[str, Any]) -> Any:
+def _get_multidict_value(
+    field: ModelField, values: Mapping[str, Any], alias: Union[str, None] = None
+) -> Any:
+    alias = alias or field.alias
     if is_sequence_field(field) and isinstance(values, (ImmutableMultiDict, Headers)):
-        value = values.getlist(field.alias)
+        value = values.getlist(alias)
     else:
-        value = values.get(field.alias, None)
+        value = values.get(alias, None)
     if (
         value is None
         or (
@@ -712,7 +732,55 @@ def request_params_to_args(
     received_params: Union[Mapping[str, Any], QueryParams, Headers],
 ) -> Tuple[Dict[str, Any], List[Any]]:
     values: Dict[str, Any] = {}
-    errors = []
+    errors: List[Dict[str, Any]] = []
+
+    if not fields:
+        return values, errors
+
+    first_field = fields[0]
+    fields_to_extract = fields
+    single_not_embedded_field = False
+    if len(fields) == 1 and lenient_issubclass(first_field.type_, BaseModel):
+        fields_to_extract = get_cached_model_fields(first_field.type_)
+        single_not_embedded_field = True
+
+    params_to_process: Dict[str, Any] = {}
+
+    processed_keys = set()
+
+    for field in fields_to_extract:
+        alias = None
+        if isinstance(received_params, Headers):
+            # Handle fields extracted from a Pydantic Model for a header, each field
+            # doesn't have a FieldInfo of type Header with the default convert_underscores=True
+            convert_underscores = getattr(field.field_info, "convert_underscores", True)
+            if convert_underscores:
+                alias = (
+                    field.alias
+                    if field.alias != field.name
+                    else field.name.replace("_", "-")
+                )
+        value = _get_multidict_value(field, received_params, alias=alias)
+        if value is not None:
+            params_to_process[field.name] = value
+        processed_keys.add(alias or field.alias)
+        processed_keys.add(field.name)
+
+    for key, value in received_params.items():
+        if key not in processed_keys:
+            params_to_process[key] = value
+
+    if single_not_embedded_field:
+        field_info = first_field.field_info
+        assert isinstance(
+            field_info, params.Param
+        ), "Params must be subclasses of Param"
+        loc: Tuple[str, ...] = (field_info.in_.value,)
+        v_, errors_ = _validate_value_with_model_field(
+            field=first_field, value=params_to_process, values=values, loc=loc
+        )
+        return {first_field.name: v_}, errors_
+
     for field in fields:
         value = _get_multidict_value(field, received_params)
         field_info = field.field_info

fastapi/openapi/utils.py

@@ -16,11 +16,15 @@ from fastapi._compat import (
 )
 from fastapi.datastructures import DefaultPlaceholder
 from fastapi.dependencies.models import Dependant
-from fastapi.dependencies.utils import get_flat_dependant, get_flat_params
+from fastapi.dependencies.utils import (
+    _get_flat_fields_from_params,
+    get_flat_dependant,
+    get_flat_params,
+)
 from fastapi.encoders import jsonable_encoder
 from fastapi.openapi.constants import METHODS_WITH_BODY, REF_PREFIX, REF_TEMPLATE
 from fastapi.openapi.models import OpenAPI
-from fastapi.params import Body, Param
+from fastapi.params import Body, ParamTypes
 from fastapi.responses import Response
 from fastapi.types import ModelNameMap
 from fastapi.utils import (
@@ -87,9 +91,9 @@ def get_openapi_security_definitions(
     return security_definitions, operation_security
 
 
-def get_openapi_operation_parameters(
+def _get_openapi_operation_parameters(
     *,
-    all_route_params: Sequence[ModelField],
+    dependant: Dependant,
     schema_generator: GenerateJsonSchema,
     model_name_map: ModelNameMap,
     field_mapping: Dict[
@@ -98,33 +102,47 @@ def get_openapi_operation_parameters(
     separate_input_output_schemas: bool = True,
 ) -> List[Dict[str, Any]]:
     parameters = []
-    for param in all_route_params:
-        field_info = param.field_info
-        field_info = cast(Param, field_info)
-        if not field_info.include_in_schema:
-            continue
-        param_schema = get_schema_from_model_field(
-            field=param,
-            schema_generator=schema_generator,
-            model_name_map=model_name_map,
-            field_mapping=field_mapping,
-            separate_input_output_schemas=separate_input_output_schemas,
-        )
-        parameter = {
-            "name": param.alias,
-            "in": field_info.in_.value,
-            "required": param.required,
-            "schema": param_schema,
-        }
-        if field_info.description:
-            parameter["description"] = field_info.description
-        if field_info.openapi_examples:
-            parameter["examples"] = jsonable_encoder(field_info.openapi_examples)
-        elif field_info.example != Undefined:
-            parameter["example"] = jsonable_encoder(field_info.example)
-        if field_info.deprecated:
-            parameter["deprecated"] = True
-        parameters.append(parameter)
+    flat_dependant = get_flat_dependant(dependant, skip_repeats=True)
+    path_params = _get_flat_fields_from_params(flat_dependant.path_params)
+    query_params = _get_flat_fields_from_params(flat_dependant.query_params)
+    header_params = _get_flat_fields_from_params(flat_dependant.header_params)
+    cookie_params = _get_flat_fields_from_params(flat_dependant.cookie_params)
+    parameter_groups = [
+        (ParamTypes.path, path_params),
+        (ParamTypes.query, query_params),
+        (ParamTypes.header, header_params),
+        (ParamTypes.cookie, cookie_params),
+    ]
+    for param_type, param_group in parameter_groups:
+        for param in param_group:
+            field_info = param.field_info
+            # field_info = cast(Param, field_info)
+            if not getattr(field_info, "include_in_schema", True):
+                continue
+            param_schema = get_schema_from_model_field(
+                field=param,
+                schema_generator=schema_generator,
+                model_name_map=model_name_map,
+                field_mapping=field_mapping,
+                separate_input_output_schemas=separate_input_output_schemas,
+            )
+            parameter = {
+                "name": param.alias,
+                "in": param_type.value,
+                "required": param.required,
+                "schema": param_schema,
+            }
+            if field_info.description:
+                parameter["description"] = field_info.description
+            openapi_examples = getattr(field_info, "openapi_examples", None)
+            example = getattr(field_info, "example", None)
+            if openapi_examples:
+                parameter["examples"] = jsonable_encoder(openapi_examples)
+            elif example != Undefined:
+                parameter["example"] = jsonable_encoder(example)
+            if getattr(field_info, "deprecated", None):
+                parameter["deprecated"] = True
+            parameters.append(parameter)
     return parameters
 
 
@@ -247,9 +265,8 @@ def get_openapi_path(
                 operation.setdefault("security", []).extend(operation_security)
             if security_definitions:
                 security_schemes.update(security_definitions)
-            all_route_params = get_flat_params(route.dependant)
-            operation_parameters = get_openapi_operation_parameters(
-                all_route_params=all_route_params,
+            operation_parameters = _get_openapi_operation_parameters(
+                dependant=route.dependant,
                 schema_generator=schema_generator,
                 model_name_map=model_name_map,
                 field_mapping=field_mapping,
@@ -379,6 +396,7 @@ def get_openapi_path(
                     deep_dict_update(openapi_response, process_response)
                     openapi_response["description"] = description
             http422 = str(HTTP_422_UNPROCESSABLE_ENTITY)
+            all_route_params = get_flat_params(route.dependant)
             if (all_route_params or route.body_field) and not any(
                 status in operation["responses"]
                 for status in [http422, "4XX", "default"]

scripts/playwright/cookie_param_models/image01.py

@@ -0,0 +1,39 @@
+import subprocess
+import time
+
+import httpx
+from playwright.sync_api import Playwright, sync_playwright
+
+
+# Run playwright codegen to generate the code below, copy paste the sections in run()
+def run(playwright: Playwright) -> None:
+    browser = playwright.chromium.launch(headless=False)
+    # Update the viewport manually
+    context = browser.new_context(viewport={"width": 960, "height": 1080})
+    browser = playwright.chromium.launch(headless=False)
+    context = browser.new_context()
+    page = context.new_page()
+    page.goto("http://localhost:8000/docs")
+    page.get_by_role("link", name="/items/").click()
+    # Manually add the screenshot
+    page.screenshot(path="docs/en/docs/img/tutorial/cookie-param-models/image01.png")
+
+    # ---------------------
+    context.close()
+    browser.close()
+
+
+process = subprocess.Popen(
+    ["fastapi", "run", "docs_src/cookie_param_models/tutorial001.py"]
+)
+try:
+    for _ in range(3):
+        try:
+            response = httpx.get("http://localhost:8000/docs")
+        except httpx.ConnectError:
+            time.sleep(1)
+            break
+    with sync_playwright() as playwright:
+        run(playwright)
+finally:
+    process.terminate()

scripts/playwright/header_param_models/image01.py

@@ -0,0 +1,38 @@
+import subprocess
+import time
+
+import httpx
+from playwright.sync_api import Playwright, sync_playwright
+
+
+# Run playwright codegen to generate the code below, copy paste the sections in run()
+def run(playwright: Playwright) -> None:
+    browser = playwright.chromium.launch(headless=False)
+    # Update the viewport manually
+    context = browser.new_context(viewport={"width": 960, "height": 1080})
+    page = context.new_page()
+    page.goto("http://localhost:8000/docs")
+    page.get_by_role("button", name="GET /items/ Read Items").click()
+    page.get_by_role("button", name="Try it out").click()
+    # Manually add the screenshot
+    page.screenshot(path="docs/en/docs/img/tutorial/header-param-models/image01.png")
+
+    # ---------------------
+    context.close()
+    browser.close()
+
+
+process = subprocess.Popen(
+    ["fastapi", "run", "docs_src/header_param_models/tutorial001.py"]
+)
+try:
+    for _ in range(3):
+        try:
+            response = httpx.get("http://localhost:8000/docs")
+        except httpx.ConnectError:
+            time.sleep(1)
+            break
+    with sync_playwright() as playwright:
+        run(playwright)
+finally:
+    process.terminate()

scripts/playwright/query_param_models/image01.py

@@ -0,0 +1,41 @@
+import subprocess
+import time
+
+import httpx
+from playwright.sync_api import Playwright, sync_playwright
+
+
+# Run playwright codegen to generate the code below, copy paste the sections in run()
+def run(playwright: Playwright) -> None:
+    browser = playwright.chromium.launch(headless=False)
+    # Update the viewport manually
+    context = browser.new_context(viewport={"width": 960, "height": 1080})
+    browser = playwright.chromium.launch(headless=False)
+    context = browser.new_context()
+    page = context.new_page()
+    page.goto("http://localhost:8000/docs")
+    page.get_by_role("button", name="GET /items/ Read Items").click()
+    page.get_by_role("button", name="Try it out").click()
+    page.get_by_role("heading", name="Servers").click()
+    # Manually add the screenshot
+    page.screenshot(path="docs/en/docs/img/tutorial/query-param-models/image01.png")
+
+    # ---------------------
+    context.close()
+    browser.close()
+
+
+process = subprocess.Popen(
+    ["fastapi", "run", "docs_src/query_param_models/tutorial001.py"]
+)
+try:
+    for _ in range(3):
+        try:
+            response = httpx.get("http://localhost:8000/docs")
+        except httpx.ConnectError:
+            time.sleep(1)
+            break
+    with sync_playwright() as playwright:
+        run(playwright)
+finally:
+    process.terminate()

tests/test_tutorial/test_cookie_param_models/test_tutorial001.py

@@ -0,0 +1,205 @@
+import importlib
+
+import pytest
+from dirty_equals import IsDict
+from fastapi.testclient import TestClient
+from inline_snapshot import snapshot
+
+from tests.utils import needs_py39, needs_py310
+
+
+@pytest.fixture(
+    name="client",
+    params=[
+        "tutorial001",
+        pytest.param("tutorial001_py310", marks=needs_py310),
+        "tutorial001_an",
+        pytest.param("tutorial001_an_py39", marks=needs_py39),
+        pytest.param("tutorial001_an_py310", marks=needs_py310),
+    ],
+)
+def get_client(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.cookie_param_models.{request.param}")
+
+    client = TestClient(mod.app)
+    return client
+
+
+def test_cookie_param_model(client: TestClient):
+    with client as c:
+        c.cookies.set("session_id", "123")
+        c.cookies.set("fatebook_tracker", "456")
+        c.cookies.set("googall_tracker", "789")
+        response = c.get("/items/")
+    assert response.status_code == 200
+    assert response.json() == {
+        "session_id": "123",
+        "fatebook_tracker": "456",
+        "googall_tracker": "789",
+    }
+
+
+def test_cookie_param_model_defaults(client: TestClient):
+    with client as c:
+        c.cookies.set("session_id", "123")
+        response = c.get("/items/")
+    assert response.status_code == 200
+    assert response.json() == {
+        "session_id": "123",
+        "fatebook_tracker": None,
+        "googall_tracker": None,
+    }
+
+
+def test_cookie_param_model_invalid(client: TestClient):
+    response = client.get("/items/")
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        IsDict(
+            {
+                "detail": [
+                    {
+                        "type": "missing",
+                        "loc": ["cookie", "session_id"],
+                        "msg": "Field required",
+                        "input": {},
+                    }
+                ]
+            }
+        )
+        | IsDict(
+            # TODO: remove when deprecating Pydantic v1
+            {
+                "detail": [
+                    {
+                        "type": "value_error.missing",
+                        "loc": ["cookie", "session_id"],
+                        "msg": "field required",
+                    }
+                ]
+            }
+        )
+    )
+
+
+def test_cookie_param_model_extra(client: TestClient):
+    with client as c:
+        c.cookies.set("session_id", "123")
+        c.cookies.set("extra", "track-me-here-too")
+        response = c.get("/items/")
+    assert response.status_code == 200
+    assert response.json() == snapshot(
+        {"session_id": "123", "fatebook_tracker": None, "googall_tracker": None}
+    )
+
+
+def test_openapi_schema(client: TestClient):
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == snapshot(
+        {
+            "openapi": "3.1.0",
+            "info": {"title": "FastAPI", "version": "0.1.0"},
+            "paths": {
+                "/items/": {
+                    "get": {
+                        "summary": "Read Items",
+                        "operationId": "read_items_items__get",
+                        "parameters": [
+                            {
+                                "name": "session_id",
+                                "in": "cookie",
+                                "required": True,
+                                "schema": {"type": "string", "title": "Session Id"},
+                            },
+                            {
+                                "name": "fatebook_tracker",
+                                "in": "cookie",
+                                "required": False,
+                                "schema": IsDict(
+                                    {
+                                        "anyOf": [{"type": "string"}, {"type": "null"}],
+                                        "title": "Fatebook Tracker",
+                                    }
+                                )
+                                | IsDict(
+                                    # TODO: remove when deprecating Pydantic v1
+                                    {
+                                        "type": "string",
+                                        "title": "Fatebook Tracker",
+                                    }
+                                ),
+                            },
+                            {
+                                "name": "googall_tracker",
+                                "in": "cookie",
+                                "required": False,
+                                "schema": IsDict(
+                                    {
+                                        "anyOf": [{"type": "string"}, {"type": "null"}],
+                                        "title": "Googall Tracker",
+                                    }
+                                )
+                                | IsDict(
+                                    # TODO: remove when deprecating Pydantic v1
+                                    {
+                                        "type": "string",
+                                        "title": "Googall Tracker",
+                                    }
+                                ),
+                            },
+                        ],
+                        "responses": {
+                            "200": {
+                                "description": "Successful Response",
+                                "content": {"application/json": {"schema": {}}},
+                            },
+                            "422": {
+                                "description": "Validation Error",
+                                "content": {
+                                    "application/json": {
+                                        "schema": {
+                                            "$ref": "#/components/schemas/HTTPValidationError"
+                                        }
+                                    }
+                                },
+                            },
+                        },
+                    }
+                }
+            },
+            "components": {
+                "schemas": {
+                    "HTTPValidationError": {
+                        "properties": {
+                            "detail": {
+                                "items": {
+                                    "$ref": "#/components/schemas/ValidationError"
+                                },
+                                "type": "array",
+                                "title": "Detail",
+                            }
+                        },
+                        "type": "object",
+                        "title": "HTTPValidationError",
+                    },
+                    "ValidationError": {
+                        "properties": {
+                            "loc": {
+                                "items": {
+                                    "anyOf": [{"type": "string"}, {"type": "integer"}]
+                                },
+                                "type": "array",
+                                "title": "Location",
+                            },
+                            "msg": {"type": "string", "title": "Message"},
+                            "type": {"type": "string", "title": "Error Type"},
+                        },
+                        "type": "object",
+                        "required": ["loc", "msg", "type"],
+                        "title": "ValidationError",
+                    },
+                }
+            },
+        }
+    )

tests/test_tutorial/test_cookie_param_models/test_tutorial002.py

@@ -0,0 +1,233 @@
+import importlib
+
+import pytest
+from dirty_equals import IsDict
+from fastapi.testclient import TestClient
+from inline_snapshot import snapshot
+
+from tests.utils import needs_py39, needs_py310, needs_pydanticv1, needs_pydanticv2
+
+
+@pytest.fixture(
+    name="client",
+    params=[
+        pytest.param("tutorial002", marks=needs_pydanticv2),
+        pytest.param("tutorial002_py310", marks=[needs_py310, needs_pydanticv2]),
+        pytest.param("tutorial002_an", marks=needs_pydanticv2),
+        pytest.param("tutorial002_an_py39", marks=[needs_py39, needs_pydanticv2]),
+        pytest.param("tutorial002_an_py310", marks=[needs_py310, needs_pydanticv2]),
+        pytest.param("tutorial002_pv1", marks=[needs_pydanticv1, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_py310", marks=[needs_py310, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an", marks=[needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an_py39", marks=[needs_py39, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an_py310", marks=[needs_py310, needs_pydanticv1]),
+    ],
+)
+def get_client(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.cookie_param_models.{request.param}")
+
+    client = TestClient(mod.app)
+    return client
+
+
+def test_cookie_param_model(client: TestClient):
+    with client as c:
+        c.cookies.set("session_id", "123")
+        c.cookies.set("fatebook_tracker", "456")
+        c.cookies.set("googall_tracker", "789")
+        response = c.get("/items/")
+    assert response.status_code == 200
+    assert response.json() == {
+        "session_id": "123",
+        "fatebook_tracker": "456",
+        "googall_tracker": "789",
+    }
+
+
+def test_cookie_param_model_defaults(client: TestClient):
+    with client as c:
+        c.cookies.set("session_id", "123")
+        response = c.get("/items/")
+    assert response.status_code == 200
+    assert response.json() == {
+        "session_id": "123",
+        "fatebook_tracker": None,
+        "googall_tracker": None,
+    }
+
+
+def test_cookie_param_model_invalid(client: TestClient):
+    response = client.get("/items/")
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        IsDict(
+            {
+                "detail": [
+                    {
+                        "type": "missing",
+                        "loc": ["cookie", "session_id"],
+                        "msg": "Field required",
+                        "input": {},
+                    }
+                ]
+            }
+        )
+        | IsDict(
+            # TODO: remove when deprecating Pydantic v1
+            {
+                "detail": [
+                    {
+                        "type": "value_error.missing",
+                        "loc": ["cookie", "session_id"],
+                        "msg": "field required",
+                    }
+                ]
+            }
+        )
+    )
+
+
+def test_cookie_param_model_extra(client: TestClient):
+    with client as c:
+        c.cookies.set("session_id", "123")
+        c.cookies.set("extra", "track-me-here-too")
+        response = c.get("/items/")
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        IsDict(
+            {
+                "detail": [
+                    {
+                        "type": "extra_forbidden",
+                        "loc": ["cookie", "extra"],
+                        "msg": "Extra inputs are not permitted",
+                        "input": "track-me-here-too",
+                    }
+                ]
+            }
+        )
+        | IsDict(
+            # TODO: remove when deprecating Pydantic v1
+            {
+                "detail": [
+                    {
+                        "type": "value_error.extra",
+                        "loc": ["cookie", "extra"],
+                        "msg": "extra fields not permitted",
+                    }
+                ]
+            }
+        )
+    )
+
+
+def test_openapi_schema(client: TestClient):
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == snapshot(
+        {
+            "openapi": "3.1.0",
+            "info": {"title": "FastAPI", "version": "0.1.0"},
+            "paths": {
+                "/items/": {
+                    "get": {
+                        "summary": "Read Items",
+                        "operationId": "read_items_items__get",
+                        "parameters": [
+                            {
+                                "name": "session_id",
+                                "in": "cookie",
+                                "required": True,
+                                "schema": {"type": "string", "title": "Session Id"},
+                            },
+                            {
+                                "name": "fatebook_tracker",
+                                "in": "cookie",
+                                "required": False,
+                                "schema": IsDict(
+                                    {
+                                        "anyOf": [{"type": "string"}, {"type": "null"}],
+                                        "title": "Fatebook Tracker",
+                                    }
+                                )
+                                | IsDict(
+                                    # TODO: remove when deprecating Pydantic v1
+                                    {
+                                        "type": "string",
+                                        "title": "Fatebook Tracker",
+                                    }
+                                ),
+                            },
+                            {
+                                "name": "googall_tracker",
+                                "in": "cookie",
+                                "required": False,
+                                "schema": IsDict(
+                                    {
+                                        "anyOf": [{"type": "string"}, {"type": "null"}],
+                                        "title": "Googall Tracker",
+                                    }
+                                )
+                                | IsDict(
+                                    # TODO: remove when deprecating Pydantic v1
+                                    {
+                                        "type": "string",
+                                        "title": "Googall Tracker",
+                                    }
+                                ),
+                            },
+                        ],
+                        "responses": {
+                            "200": {
+                                "description": "Successful Response",
+                                "content": {"application/json": {"schema": {}}},
+                            },
+                            "422": {
+                                "description": "Validation Error",
+                                "content": {
+                                    "application/json": {
+                                        "schema": {
+                                            "$ref": "#/components/schemas/HTTPValidationError"
+                                        }
+                                    }
+                                },
+                            },
+                        },
+                    }
+                }
+            },
+            "components": {
+                "schemas": {
+                    "HTTPValidationError": {
+                        "properties": {
+                            "detail": {
+                                "items": {
+                                    "$ref": "#/components/schemas/ValidationError"
+                                },
+                                "type": "array",
+                                "title": "Detail",
+                            }
+                        },
+                        "type": "object",
+                        "title": "HTTPValidationError",
+                    },
+                    "ValidationError": {
+                        "properties": {
+                            "loc": {
+                                "items": {
+                                    "anyOf": [{"type": "string"}, {"type": "integer"}]
+                                },
+                                "type": "array",
+                                "title": "Location",
+                            },
+                            "msg": {"type": "string", "title": "Message"},
+                            "type": {"type": "string", "title": "Error Type"},
+                        },
+                        "type": "object",
+                        "required": ["loc", "msg", "type"],
+                        "title": "ValidationError",
+                    },
+                }
+            },
+        }
+    )

tests/test_tutorial/test_header_param_models/test_tutorial001.py

@@ -0,0 +1,238 @@
+import importlib
+
+import pytest
+from dirty_equals import IsDict
+from fastapi.testclient import TestClient
+from inline_snapshot import snapshot
+
+from tests.utils import needs_py39, needs_py310
+
+
+@pytest.fixture(
+    name="client",
+    params=[
+        "tutorial001",
+        pytest.param("tutorial001_py39", marks=needs_py39),
+        pytest.param("tutorial001_py310", marks=needs_py310),
+        "tutorial001_an",
+        pytest.param("tutorial001_an_py39", marks=needs_py39),
+        pytest.param("tutorial001_an_py310", marks=needs_py310),
+    ],
+)
+def get_client(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.header_param_models.{request.param}")
+
+    client = TestClient(mod.app)
+    return client
+
+
+def test_header_param_model(client: TestClient):
+    response = client.get(
+        "/items/",
+        headers=[
+            ("save-data", "true"),
+            ("if-modified-since", "yesterday"),
+            ("traceparent", "123"),
+            ("x-tag", "one"),
+            ("x-tag", "two"),
+        ],
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "host": "testserver",
+        "save_data": True,
+        "if_modified_since": "yesterday",
+        "traceparent": "123",
+        "x_tag": ["one", "two"],
+    }
+
+
+def test_header_param_model_defaults(client: TestClient):
+    response = client.get("/items/", headers=[("save-data", "true")])
+    assert response.status_code == 200
+    assert response.json() == {
+        "host": "testserver",
+        "save_data": True,
+        "if_modified_since": None,
+        "traceparent": None,
+        "x_tag": [],
+    }
+
+
+def test_header_param_model_invalid(client: TestClient):
+    response = client.get("/items/")
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        {
+            "detail": [
+                IsDict(
+                    {
+                        "type": "missing",
+                        "loc": ["header", "save_data"],
+                        "msg": "Field required",
+                        "input": {
+                            "x_tag": [],
+                            "host": "testserver",
+                            "accept": "*/*",
+                            "accept-encoding": "gzip, deflate",
+                            "connection": "keep-alive",
+                            "user-agent": "testclient",
+                        },
+                    }
+                )
+                | IsDict(
+                    # TODO: remove when deprecating Pydantic v1
+                    {
+                        "type": "value_error.missing",
+                        "loc": ["header", "save_data"],
+                        "msg": "field required",
+                    }
+                )
+            ]
+        }
+    )
+
+
+def test_header_param_model_extra(client: TestClient):
+    response = client.get(
+        "/items/", headers=[("save-data", "true"), ("tool", "plumbus")]
+    )
+    assert response.status_code == 200, response.text
+    assert response.json() == snapshot(
+        {
+            "host": "testserver",
+            "save_data": True,
+            "if_modified_since": None,
+            "traceparent": None,
+            "x_tag": [],
+        }
+    )
+
+
+def test_openapi_schema(client: TestClient):
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == snapshot(
+        {
+            "openapi": "3.1.0",
+            "info": {"title": "FastAPI", "version": "0.1.0"},
+            "paths": {
+                "/items/": {
+                    "get": {
+                        "summary": "Read Items",
+                        "operationId": "read_items_items__get",
+                        "parameters": [
+                            {
+                                "name": "host",
+                                "in": "header",
+                                "required": True,
+                                "schema": {"type": "string", "title": "Host"},
+                            },
+                            {
+                                "name": "save_data",
+                                "in": "header",
+                                "required": True,
+                                "schema": {"type": "boolean", "title": "Save Data"},
+                            },
+                            {
+                                "name": "if_modified_since",
+                                "in": "header",
+                                "required": False,
+                                "schema": IsDict(
+                                    {
+                                        "anyOf": [{"type": "string"}, {"type": "null"}],
+                                        "title": "If Modified Since",
+                                    }
+                                )
+                                | IsDict(
+                                    # TODO: remove when deprecating Pydantic v1
+                                    {
+                                        "type": "string",
+                                        "title": "If Modified Since",
+                                    }
+                                ),
+                            },
+                            {
+                                "name": "traceparent",
+                                "in": "header",
+                                "required": False,
+                                "schema": IsDict(
+                                    {
+                                        "anyOf": [{"type": "string"}, {"type": "null"}],
+                                        "title": "Traceparent",
+                                    }
+                                )
+                                | IsDict(
+                                    # TODO: remove when deprecating Pydantic v1
+                                    {
+                                        "type": "string",
+                                        "title": "Traceparent",
+                                    }
+                                ),
+                            },
+                            {
+                                "name": "x_tag",
+                                "in": "header",
+                                "required": False,
+                                "schema": {
+                                    "type": "array",
+                                    "items": {"type": "string"},
+                                    "default": [],
+                                    "title": "X Tag",
+                                },
+                            },
+                        ],
+                        "responses": {
+                            "200": {
+                                "description": "Successful Response",
+                                "content": {"application/json": {"schema": {}}},
+                            },
+                            "422": {
+                                "description": "Validation Error",
+                                "content": {
+                                    "application/json": {
+                                        "schema": {
+                                            "$ref": "#/components/schemas/HTTPValidationError"
+                                        }
+                                    }
+                                },
+                            },
+                        },
+                    }
+                }
+            },
+            "components": {
+                "schemas": {
+                    "HTTPValidationError": {
+                        "properties": {
+                            "detail": {
+                                "items": {
+                                    "$ref": "#/components/schemas/ValidationError"
+                                },
+                                "type": "array",
+                                "title": "Detail",
+                            }
+                        },
+                        "type": "object",
+                        "title": "HTTPValidationError",
+                    },
+                    "ValidationError": {
+                        "properties": {
+                            "loc": {
+                                "items": {
+                                    "anyOf": [{"type": "string"}, {"type": "integer"}]
+                                },
+                                "type": "array",
+                                "title": "Location",
+                            },
+                            "msg": {"type": "string", "title": "Message"},
+                            "type": {"type": "string", "title": "Error Type"},
+                        },
+                        "type": "object",
+                        "required": ["loc", "msg", "type"],
+                        "title": "ValidationError",
+                    },
+                }
+            },
+        }
+    )

tests/test_tutorial/test_header_param_models/test_tutorial002.py

@@ -0,0 +1,249 @@
+import importlib
+
+import pytest
+from dirty_equals import IsDict
+from fastapi.testclient import TestClient
+from inline_snapshot import snapshot
+
+from tests.utils import needs_py39, needs_py310, needs_pydanticv1, needs_pydanticv2
+
+
+@pytest.fixture(
+    name="client",
+    params=[
+        pytest.param("tutorial002", marks=needs_pydanticv2),
+        pytest.param("tutorial002_py310", marks=[needs_py310, needs_pydanticv2]),
+        pytest.param("tutorial002_an", marks=needs_pydanticv2),
+        pytest.param("tutorial002_an_py39", marks=[needs_py39, needs_pydanticv2]),
+        pytest.param("tutorial002_an_py310", marks=[needs_py310, needs_pydanticv2]),
+        pytest.param("tutorial002_pv1", marks=[needs_pydanticv1, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_py310", marks=[needs_py310, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an", marks=[needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an_py39", marks=[needs_py39, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an_py310", marks=[needs_py310, needs_pydanticv1]),
+    ],
+)
+def get_client(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.header_param_models.{request.param}")
+
+    client = TestClient(mod.app)
+    client.headers.clear()
+    return client
+
+
+def test_header_param_model(client: TestClient):
+    response = client.get(
+        "/items/",
+        headers=[
+            ("save-data", "true"),
+            ("if-modified-since", "yesterday"),
+            ("traceparent", "123"),
+            ("x-tag", "one"),
+            ("x-tag", "two"),
+        ],
+    )
+    assert response.status_code == 200, response.text
+    assert response.json() == {
+        "host": "testserver",
+        "save_data": True,
+        "if_modified_since": "yesterday",
+        "traceparent": "123",
+        "x_tag": ["one", "two"],
+    }
+
+
+def test_header_param_model_defaults(client: TestClient):
+    response = client.get("/items/", headers=[("save-data", "true")])
+    assert response.status_code == 200
+    assert response.json() == {
+        "host": "testserver",
+        "save_data": True,
+        "if_modified_since": None,
+        "traceparent": None,
+        "x_tag": [],
+    }
+
+
+def test_header_param_model_invalid(client: TestClient):
+    response = client.get("/items/")
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        {
+            "detail": [
+                IsDict(
+                    {
+                        "type": "missing",
+                        "loc": ["header", "save_data"],
+                        "msg": "Field required",
+                        "input": {"x_tag": [], "host": "testserver"},
+                    }
+                )
+                | IsDict(
+                    # TODO: remove when deprecating Pydantic v1
+                    {
+                        "type": "value_error.missing",
+                        "loc": ["header", "save_data"],
+                        "msg": "field required",
+                    }
+                )
+            ]
+        }
+    )
+
+
+def test_header_param_model_extra(client: TestClient):
+    response = client.get(
+        "/items/", headers=[("save-data", "true"), ("tool", "plumbus")]
+    )
+    assert response.status_code == 422, response.text
+    assert response.json() == snapshot(
+        {
+            "detail": [
+                IsDict(
+                    {
+                        "type": "extra_forbidden",
+                        "loc": ["header", "tool"],
+                        "msg": "Extra inputs are not permitted",
+                        "input": "plumbus",
+                    }
+                )
+                | IsDict(
+                    # TODO: remove when deprecating Pydantic v1
+                    {
+                        "type": "value_error.extra",
+                        "loc": ["header", "tool"],
+                        "msg": "extra fields not permitted",
+                    }
+                )
+            ]
+        }
+    )
+
+
+def test_openapi_schema(client: TestClient):
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == snapshot(
+        {
+            "openapi": "3.1.0",
+            "info": {"title": "FastAPI", "version": "0.1.0"},
+            "paths": {
+                "/items/": {
+                    "get": {
+                        "summary": "Read Items",
+                        "operationId": "read_items_items__get",
+                        "parameters": [
+                            {
+                                "name": "host",
+                                "in": "header",
+                                "required": True,
+                                "schema": {"type": "string", "title": "Host"},
+                            },
+                            {
+                                "name": "save_data",
+                                "in": "header",
+                                "required": True,
+                                "schema": {"type": "boolean", "title": "Save Data"},
+                            },
+                            {
+                                "name": "if_modified_since",
+                                "in": "header",
+                                "required": False,
+                                "schema": IsDict(
+                                    {
+                                        "anyOf": [{"type": "string"}, {"type": "null"}],
+                                        "title": "If Modified Since",
+                                    }
+                                )
+                                | IsDict(
+                                    # TODO: remove when deprecating Pydantic v1
+                                    {
+                                        "type": "string",
+                                        "title": "If Modified Since",
+                                    }
+                                ),
+                            },
+                            {
+                                "name": "traceparent",
+                                "in": "header",
+                                "required": False,
+                                "schema": IsDict(
+                                    {
+                                        "anyOf": [{"type": "string"}, {"type": "null"}],
+                                        "title": "Traceparent",
+                                    }
+                                )
+                                | IsDict(
+                                    # TODO: remove when deprecating Pydantic v1
+                                    {
+                                        "type": "string",
+                                        "title": "Traceparent",
+                                    }
+                                ),
+                            },
+                            {
+                                "name": "x_tag",
+                                "in": "header",
+                                "required": False,
+                                "schema": {
+                                    "type": "array",
+                                    "items": {"type": "string"},
+                                    "default": [],
+                                    "title": "X Tag",
+                                },
+                            },
+                        ],
+                        "responses": {
+                            "200": {
+                                "description": "Successful Response",
+                                "content": {"application/json": {"schema": {}}},
+                            },
+                            "422": {
+                                "description": "Validation Error",
+                                "content": {
+                                    "application/json": {
+                                        "schema": {
+                                            "$ref": "#/components/schemas/HTTPValidationError"
+                                        }
+                                    }
+                                },
+                            },
+                        },
+                    }
+                }
+            },
+            "components": {
+                "schemas": {
+                    "HTTPValidationError": {
+                        "properties": {
+                            "detail": {
+                                "items": {
+                                    "$ref": "#/components/schemas/ValidationError"
+                                },
+                                "type": "array",
+                                "title": "Detail",
+                            }
+                        },
+                        "type": "object",
+                        "title": "HTTPValidationError",
+                    },
+                    "ValidationError": {
+                        "properties": {
+                            "loc": {
+                                "items": {
+                                    "anyOf": [{"type": "string"}, {"type": "integer"}]
+                                },
+                                "type": "array",
+                                "title": "Location",
+                            },
+                            "msg": {"type": "string", "title": "Message"},
+                            "type": {"type": "string", "title": "Error Type"},
+                        },
+                        "type": "object",
+                        "required": ["loc", "msg", "type"],
+                        "title": "ValidationError",
+                    },
+                }
+            },
+        }
+    )

tests/test_tutorial/test_query_param_models/test_tutorial001.py

@@ -0,0 +1,260 @@
+import importlib
+
+import pytest
+from dirty_equals import IsDict
+from fastapi.testclient import TestClient
+from inline_snapshot import snapshot
+
+from tests.utils import needs_py39, needs_py310
+
+
+@pytest.fixture(
+    name="client",
+    params=[
+        "tutorial001",
+        pytest.param("tutorial001_py39", marks=needs_py39),
+        pytest.param("tutorial001_py310", marks=needs_py310),
+        "tutorial001_an",
+        pytest.param("tutorial001_an_py39", marks=needs_py39),
+        pytest.param("tutorial001_an_py310", marks=needs_py310),
+    ],
+)
+def get_client(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.query_param_models.{request.param}")
+
+    client = TestClient(mod.app)
+    return client
+
+
+def test_query_param_model(client: TestClient):
+    response = client.get(
+        "/items/",
+        params={
+            "limit": 10,
+            "offset": 5,
+            "order_by": "updated_at",
+            "tags": ["tag1", "tag2"],
+        },
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "limit": 10,
+        "offset": 5,
+        "order_by": "updated_at",
+        "tags": ["tag1", "tag2"],
+    }
+
+
+def test_query_param_model_defaults(client: TestClient):
+    response = client.get("/items/")
+    assert response.status_code == 200
+    assert response.json() == {
+        "limit": 100,
+        "offset": 0,
+        "order_by": "created_at",
+        "tags": [],
+    }
+
+
+def test_query_param_model_invalid(client: TestClient):
+    response = client.get(
+        "/items/",
+        params={
+            "limit": 150,
+            "offset": -1,
+            "order_by": "invalid",
+        },
+    )
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        IsDict(
+            {
+                "detail": [
+                    {
+                        "type": "less_than_equal",
+                        "loc": ["query", "limit"],
+                        "msg": "Input should be less than or equal to 100",
+                        "input": "150",
+                        "ctx": {"le": 100},
+                    },
+                    {
+                        "type": "greater_than_equal",
+                        "loc": ["query", "offset"],
+                        "msg": "Input should be greater than or equal to 0",
+                        "input": "-1",
+                        "ctx": {"ge": 0},
+                    },
+                    {
+                        "type": "literal_error",
+                        "loc": ["query", "order_by"],
+                        "msg": "Input should be 'created_at' or 'updated_at'",
+                        "input": "invalid",
+                        "ctx": {"expected": "'created_at' or 'updated_at'"},
+                    },
+                ]
+            }
+        )
+        | IsDict(
+            # TODO: remove when deprecating Pydantic v1
+            {
+                "detail": [
+                    {
+                        "type": "value_error.number.not_le",
+                        "loc": ["query", "limit"],
+                        "msg": "ensure this value is less than or equal to 100",
+                        "ctx": {"limit_value": 100},
+                    },
+                    {
+                        "type": "value_error.number.not_ge",
+                        "loc": ["query", "offset"],
+                        "msg": "ensure this value is greater than or equal to 0",
+                        "ctx": {"limit_value": 0},
+                    },
+                    {
+                        "type": "value_error.const",
+                        "loc": ["query", "order_by"],
+                        "msg": "unexpected value; permitted: 'created_at', 'updated_at'",
+                        "ctx": {
+                            "given": "invalid",
+                            "permitted": ["created_at", "updated_at"],
+                        },
+                    },
+                ]
+            }
+        )
+    )
+
+
+def test_query_param_model_extra(client: TestClient):
+    response = client.get(
+        "/items/",
+        params={
+            "limit": 10,
+            "offset": 5,
+            "order_by": "updated_at",
+            "tags": ["tag1", "tag2"],
+            "tool": "plumbus",
+        },
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "limit": 10,
+        "offset": 5,
+        "order_by": "updated_at",
+        "tags": ["tag1", "tag2"],
+    }
+
+
+def test_openapi_schema(client: TestClient):
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == snapshot(
+        {
+            "openapi": "3.1.0",
+            "info": {"title": "FastAPI", "version": "0.1.0"},
+            "paths": {
+                "/items/": {
+                    "get": {
+                        "summary": "Read Items",
+                        "operationId": "read_items_items__get",
+                        "parameters": [
+                            {
+                                "name": "limit",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "type": "integer",
+                                    "maximum": 100,
+                                    "exclusiveMinimum": 0,
+                                    "default": 100,
+                                    "title": "Limit",
+                                },
+                            },
+                            {
+                                "name": "offset",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "type": "integer",
+                                    "minimum": 0,
+                                    "default": 0,
+                                    "title": "Offset",
+                                },
+                            },
+                            {
+                                "name": "order_by",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "enum": ["created_at", "updated_at"],
+                                    "type": "string",
+                                    "default": "created_at",
+                                    "title": "Order By",
+                                },
+                            },
+                            {
+                                "name": "tags",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "type": "array",
+                                    "items": {"type": "string"},
+                                    "default": [],
+                                    "title": "Tags",
+                                },
+                            },
+                        ],
+                        "responses": {
+                            "200": {
+                                "description": "Successful Response",
+                                "content": {"application/json": {"schema": {}}},
+                            },
+                            "422": {
+                                "description": "Validation Error",
+                                "content": {
+                                    "application/json": {
+                                        "schema": {
+                                            "$ref": "#/components/schemas/HTTPValidationError"
+                                        }
+                                    }
+                                },
+                            },
+                        },
+                    }
+                }
+            },
+            "components": {
+                "schemas": {
+                    "HTTPValidationError": {
+                        "properties": {
+                            "detail": {
+                                "items": {
+                                    "$ref": "#/components/schemas/ValidationError"
+                                },
+                                "type": "array",
+                                "title": "Detail",
+                            }
+                        },
+                        "type": "object",
+                        "title": "HTTPValidationError",
+                    },
+                    "ValidationError": {
+                        "properties": {
+                            "loc": {
+                                "items": {
+                                    "anyOf": [{"type": "string"}, {"type": "integer"}]
+                                },
+                                "type": "array",
+                                "title": "Location",
+                            },
+                            "msg": {"type": "string", "title": "Message"},
+                            "type": {"type": "string", "title": "Error Type"},
+                        },
+                        "type": "object",
+                        "required": ["loc", "msg", "type"],
+                        "title": "ValidationError",
+                    },
+                }
+            },
+        }
+    )

tests/test_tutorial/test_query_param_models/test_tutorial002.py

@@ -0,0 +1,282 @@
+import importlib
+
+import pytest
+from dirty_equals import IsDict
+from fastapi.testclient import TestClient
+from inline_snapshot import snapshot
+
+from tests.utils import needs_py39, needs_py310, needs_pydanticv1, needs_pydanticv2
+
+
+@pytest.fixture(
+    name="client",
+    params=[
+        pytest.param("tutorial002", marks=needs_pydanticv2),
+        pytest.param("tutorial002_py39", marks=[needs_py39, needs_pydanticv2]),
+        pytest.param("tutorial002_py310", marks=[needs_py310, needs_pydanticv2]),
+        pytest.param("tutorial002_an", marks=needs_pydanticv2),
+        pytest.param("tutorial002_an_py39", marks=[needs_py39, needs_pydanticv2]),
+        pytest.param("tutorial002_an_py310", marks=[needs_py310, needs_pydanticv2]),
+        pytest.param("tutorial002_pv1", marks=[needs_pydanticv1, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_py39", marks=[needs_py39, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_py310", marks=[needs_py310, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an", marks=[needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an_py39", marks=[needs_py39, needs_pydanticv1]),
+        pytest.param("tutorial002_pv1_an_py310", marks=[needs_py310, needs_pydanticv1]),
+    ],
+)
+def get_client(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.query_param_models.{request.param}")
+
+    client = TestClient(mod.app)
+    return client
+
+
+def test_query_param_model(client: TestClient):
+    response = client.get(
+        "/items/",
+        params={
+            "limit": 10,
+            "offset": 5,
+            "order_by": "updated_at",
+            "tags": ["tag1", "tag2"],
+        },
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "limit": 10,
+        "offset": 5,
+        "order_by": "updated_at",
+        "tags": ["tag1", "tag2"],
+    }
+
+
+def test_query_param_model_defaults(client: TestClient):
+    response = client.get("/items/")
+    assert response.status_code == 200
+    assert response.json() == {
+        "limit": 100,
+        "offset": 0,
+        "order_by": "created_at",
+        "tags": [],
+    }
+
+
+def test_query_param_model_invalid(client: TestClient):
+    response = client.get(
+        "/items/",
+        params={
+            "limit": 150,
+            "offset": -1,
+            "order_by": "invalid",
+        },
+    )
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        IsDict(
+            {
+                "detail": [
+                    {
+                        "type": "less_than_equal",
+                        "loc": ["query", "limit"],
+                        "msg": "Input should be less than or equal to 100",
+                        "input": "150",
+                        "ctx": {"le": 100},
+                    },
+                    {
+                        "type": "greater_than_equal",
+                        "loc": ["query", "offset"],
+                        "msg": "Input should be greater than or equal to 0",
+                        "input": "-1",
+                        "ctx": {"ge": 0},
+                    },
+                    {
+                        "type": "literal_error",
+                        "loc": ["query", "order_by"],
+                        "msg": "Input should be 'created_at' or 'updated_at'",
+                        "input": "invalid",
+                        "ctx": {"expected": "'created_at' or 'updated_at'"},
+                    },
+                ]
+            }
+        )
+        | IsDict(
+            # TODO: remove when deprecating Pydantic v1
+            {
+                "detail": [
+                    {
+                        "type": "value_error.number.not_le",
+                        "loc": ["query", "limit"],
+                        "msg": "ensure this value is less than or equal to 100",
+                        "ctx": {"limit_value": 100},
+                    },
+                    {
+                        "type": "value_error.number.not_ge",
+                        "loc": ["query", "offset"],
+                        "msg": "ensure this value is greater than or equal to 0",
+                        "ctx": {"limit_value": 0},
+                    },
+                    {
+                        "type": "value_error.const",
+                        "loc": ["query", "order_by"],
+                        "msg": "unexpected value; permitted: 'created_at', 'updated_at'",
+                        "ctx": {
+                            "given": "invalid",
+                            "permitted": ["created_at", "updated_at"],
+                        },
+                    },
+                ]
+            }
+        )
+    )
+
+
+def test_query_param_model_extra(client: TestClient):
+    response = client.get(
+        "/items/",
+        params={
+            "limit": 10,
+            "offset": 5,
+            "order_by": "updated_at",
+            "tags": ["tag1", "tag2"],
+            "tool": "plumbus",
+        },
+    )
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        {
+            "detail": [
+                IsDict(
+                    {
+                        "type": "extra_forbidden",
+                        "loc": ["query", "tool"],
+                        "msg": "Extra inputs are not permitted",
+                        "input": "plumbus",
+                    }
+                )
+                | IsDict(
+                    # TODO: remove when deprecating Pydantic v1
+                    {
+                        "type": "value_error.extra",
+                        "loc": ["query", "tool"],
+                        "msg": "extra fields not permitted",
+                    }
+                )
+            ]
+        }
+    )
+
+
+def test_openapi_schema(client: TestClient):
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == snapshot(
+        {
+            "openapi": "3.1.0",
+            "info": {"title": "FastAPI", "version": "0.1.0"},
+            "paths": {
+                "/items/": {
+                    "get": {
+                        "summary": "Read Items",
+                        "operationId": "read_items_items__get",
+                        "parameters": [
+                            {
+                                "name": "limit",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "type": "integer",
+                                    "maximum": 100,
+                                    "exclusiveMinimum": 0,
+                                    "default": 100,
+                                    "title": "Limit",
+                                },
+                            },
+                            {
+                                "name": "offset",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "type": "integer",
+                                    "minimum": 0,
+                                    "default": 0,
+                                    "title": "Offset",
+                                },
+                            },
+                            {
+                                "name": "order_by",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "enum": ["created_at", "updated_at"],
+                                    "type": "string",
+                                    "default": "created_at",
+                                    "title": "Order By",
+                                },
+                            },
+                            {
+                                "name": "tags",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "type": "array",
+                                    "items": {"type": "string"},
+                                    "default": [],
+                                    "title": "Tags",
+                                },
+                            },
+                        ],
+                        "responses": {
+                            "200": {
+                                "description": "Successful Response",
+                                "content": {"application/json": {"schema": {}}},
+                            },
+                            "422": {
+                                "description": "Validation Error",
+                                "content": {
+                                    "application/json": {
+                                        "schema": {
+                                            "$ref": "#/components/schemas/HTTPValidationError"
+                                        }
+                                    }
+                                },
+                            },
+                        },
+                    }
+                }
+            },
+            "components": {
+                "schemas": {
+                    "HTTPValidationError": {
+                        "properties": {
+                            "detail": {
+                                "items": {
+                                    "$ref": "#/components/schemas/ValidationError"
+                                },
+                                "type": "array",
+                                "title": "Detail",
+                            }
+                        },
+                        "type": "object",
+                        "title": "HTTPValidationError",
+                    },
+                    "ValidationError": {
+                        "properties": {
+                            "loc": {
+                                "items": {
+                                    "anyOf": [{"type": "string"}, {"type": "integer"}]
+                                },
+                                "type": "array",
+                                "title": "Location",
+                            },
+                            "msg": {"type": "string", "title": "Message"},
+                            "type": {"type": "string", "title": "Error Type"},
+                        },
+                        "type": "object",
+                        "required": ["loc", "msg", "type"],
+                        "title": "ValidationError",
+                    },
+                }
+            },
+        }
+    )