* and `:path`.
   */
  fun onRequest(
    streamId: Int,
    requestHeaders: List<Header>,
  ): Boolean

  /**
   * The response headers corresponding to a pushed request.  When [last] is true, there are
   * no data frames to follow.
   *
   * @param streamId server-initiated stream ID: an even number.
   * @param responseHeaders minimally includes `:status`.

/// warning | Achtung

Bevor Sie `convert_underscores` auf `False` setzen, bedenken Sie, dass manche HTTP-Proxys und Server die Verwendung von Headern mit Unterstrichen nicht erlauben.

///

## Doppelte Header { #duplicate-headers }

Es ist möglich, doppelte Header zu empfangen. Damit ist gemeint, denselben Header mit mehreren Werten.

Sie können solche Fälle definieren, indem Sie in der Typdeklaration eine Liste verwenden.

          recoveredFailures += e
          newRoutePlanner = false
          continue
        }

        // Clear out downstream interceptor's additional request headers, cookies, etc.
        response =
          response
            .newBuilder()
            .request(request)
            .priorResponse(priorResponse?.stripBody())
            .build()

	mimeXML mimeType = "application/xml"
)

// writeSuccessResponseJSON writes success headers and response if any,
// with content-type set to `application/json`.
func writeSuccessResponseJSON(w http.ResponseWriter, response []byte) {
	writeResponse(w, http.StatusOK, response, mimeJSON)
}

// writeSuccessResponseXML writes success headers and response if any,
// with content-type set to `application/xml`.

If you are running your container behind a TLS Termination Proxy (load balancer) like Nginx or Traefik, add the option `--proxy-headers`, this will tell Uvicorn (through the FastAPI CLI) to trust the headers sent by that proxy telling it that the application is running behind HTTPS, etc.

```Dockerfile
CMD ["fastapi", "run", "app/main.py", "--proxy-headers", "--port", "80"]
```

#### Docker Cache { #docker-cache }

Pero puedes devolver un `JSONResponse` directamente desde tus *path operations*.

Esto podría ser útil, por ejemplo, para devolver headers o cookies personalizados.

## Devolver una `Response` { #return-a-response }

De hecho, puedes devolver cualquier `Response` o cualquier subclase de ella.

/// tip | Consejo

@app.get("/", dependencies=[Depends(bearer_scheme)])
async def get_root():
    return {"message": "Hello, World!"}


client = TestClient(app)


def test_get_root():
    response = client.get("/", headers={"Authorization": "Bearer token"})
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Hello, World!"}


def test_get_root_no_token():
    response = client.get("/")

<div class="screenshot">
<img src="/img/tutorial/header-param-models/image01.png">
</div>

## Как запретить дополнительные заголовки { #forbid-extra-headers }

В некоторых случаях (не особо часто встречающихся) вам может понадобиться **ограничить** заголовки, которые вы хотите получать.

	objInfo, err := getObjectInfo(ctx, bucket, object, gopts)
	if err != nil {
		// Versioning enabled quite possibly object is deleted might be delete-marker
		// if present set the headers, no idea why AWS S3 sets these headers.
		if objInfo.VersionID != "" && objInfo.DeleteMarker {
			w.Header()[xhttp.AmzVersionID] = []string{objInfo.VersionID}
			w.Header()[xhttp.AmzDeleteMarker] = []string{strconv.FormatBool(objInfo.DeleteMarker)}

    val request = Builder().url(url).build()
    client
      .newCall(request)
      .execute()
      .use { response ->
        if (!response.isSuccessful) {
          val responseHeaders = response.headers
          for (i in 0 until responseHeaders.size) {
            println(responseHeaders.name(i) + ": " + responseHeaders.value(i))
          }
          throw IOException("Unexpected code $response")
        }