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📝 Document additional parameters for response_model (#1427) 

* Documented additional parameters

These are included in a recent PR (https://github.com/tiangolo/fastapi/pull/1166) but not in the docs yet.
* response_model_exclude_none
* response_model_exclude_defaults

* 📝 Update note about response_model_exclude_defaults and response_model_exclude_none

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
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docs/en/docs/tutorial/response-model.md
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@ -124,6 +124,14 @@ So, if you send a request to that *path operation* for the item with ID `foo`, t
!!! info
FastAPI uses Pydantic model's `.dict()` with <a href="https://pydantic-docs.helpmanual.io/usage/exporting_models/#modeldict" class="external-link" target="_blank">its `exclude_unset` parameter</a> to achieve this.
!!! info
You can also use:
* `response_model_exclude_defaults=True`
* `response_model_exclude_none=True`
as described in <a href="https://pydantic-docs.helpmanual.io/usage/exporting_models/#modeldict" class="external-link" target="_blank">the Pydantic docs</a> for `exclude_defaults` and `exclude_none`.
#### Data with values for fields with defaults
But if your data has values for the model's fields with default values, like the item with ID `bar`: