assertThat(rewrittenResponse.trailers()).isEqualTo(headersOf("t1", "v1"))
    }
  }

  /**
   * We had a bug where a custom `ResponseBody` interacted poorly with `Response.trailers()`.
   * Confirm custom trailers can be read without even accessing the response body.
   */
  @Test
  fun customTrailersDoNotUseResponseBody() {
    val response =
      Response

        if (mojoExecutionConfigurator == null) {
            //
            // The plugin has a custom component configurator but does not have a custom mojo execution configurator
            // so fall back to the default mojo execution configurator.
            //
            mojoExecutionConfigurator = mojoExecutionConfigurators.get("default");

            out.print(text);
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    /**
     * Writes custom headers to the HTTP response.
     * @param response The HTTP servlet response.
     */
    protected abstract void writeHeaders(final HttpServletResponse response);

    }

    /**
     * Test constructor AvSingleHost(byte[] customData, byte[] machineId).
     * Should correctly encode custom data and machine ID.
     */
    @Test
    void testAvSingleHostCustomDataMachineIdConstructor() {
        byte[] customData = new byte[8];
        customData[0] = 0x01;
        customData[7] = 0x08;

    public String handlerName;

    /** Parameters passed to the data handler */
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String handlerParameter;

    /** Script for custom data processing logic */
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String handlerScript;

    /** Boost value for documents from this data source */
    @Required
    @ValidateTypeFailure

    * Pydantic также позволяет представить его как "Кодировку разницы во времени ISO 8601", <a href="https://docs.pydantic.dev/latest/concepts/serialization/#custom-serializers" class="external-link" target="_blank">см. документацию для получения дополнительной информации</a>.
* `frozenset`:
    * В запросах и ответах обрабатывается так же, как и `set`:

It might also help avoid confusion for new developers that see an unused parameter in your code and could think it's unnecessary.

///

/// info

In this example we use invented custom headers `X-Key` and `X-Token`.

But in real cases, when implementing security, you would get more benefits from using the integrated [Security utilities (the next chapter)](../security/index.md){.internal-link target=_blank}.

    * Wird in Requests und Responses als `float` der Gesamtsekunden dargestellt.
    * Pydantic ermöglicht auch die Darstellung als „ISO 8601 Zeitdifferenz-Kodierung“, <a href="https://docs.pydantic.dev/latest/concepts/serialization/#custom-serializers" class="external-link" target="_blank">siehe die Dokumentation für weitere Informationen</a>.
* `frozenset`:
    * Wird in Requests und Responses wie ein `set` behandelt:

Y como el `Response` se puede usar frecuentemente para establecer headers y cookies, **FastAPI** también lo proporciona en `fastapi.Response`.

///

## Headers Personalizados { #custom-headers }

Ten en cuenta que los headers propietarios personalizados se pueden agregar <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers" class="external-link" target="_blank">usando el prefijo `X-`</a>.

from pydantic import BaseModel

app = FastAPI()

media_type = "application/vnd.api+json"


# NOTE: These are not valid JSON:API resources
# but they are fine for testing requestBody with custom media_type
class Product(BaseModel):
    name: str
    price: float


class Shop(BaseModel):
    name: str


@app.post("/products")