server: strip content-length header on proxy (#17734)

tools/server/server-models.cpp

@@ -900,6 +900,7 @@ static bool should_strip_proxy_header(const std::string & header_name) {
     // Headers that get duplicated when router forwards child responses
     if (header_name == "server" ||
         header_name == "transfer-encoding" ||
+        header_name == "content-length" || // quick fix for https://github.com/ggml-org/llama.cpp/issues/17710
         header_name == "keep-alive") {
         return true;
     }