* 👆 💪 ⤴️ 🔀 🌅 `response` ⏭ 🛬 ⚫️.

{* ../../docs_src/middleware/tutorial001.py hl[8:9,11,14] *}

/// tip

✔️ 🤯 👈 🛃 © 🎚 💪 🚮 <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers" class="external-link" target="_blank">⚙️ '✖-' 🔡</a>.

  }

  @Test
  fun worksIfTrailersSet() {
    val response =
      newResponse("".toResponseBody()) {
        trailers(
          object : TrailersSource {
            override fun get() = Headers.headersOf("a", "b")
          },
        )
      }

    assertThat(response.trailers()["a"]).isEqualTo("b")
  }

  @Test fun peekAfterReadingResponse() {
    val response = newResponse(responseBody("abc"))

    assertThat(cacheControl.onlyIfCached).isTrue()
    assertThat(cacheControl.noTransform).isTrue()
    assertThat(cacheControl.immutable).isTrue()

    // These members are accessible to response headers only.
    assertThat(cacheControl.sMaxAgeSeconds).isEqualTo(-1)
    assertThat(cacheControl.isPrivate).isFalse()
    assertThat(cacheControl.isPublic).isFalse()
    assertThat(cacheControl.mustRevalidate).isFalse()
  }

* Para pasar un cuerpo JSON, pasa un objeto de Python (por ejemplo, un `dict`) al parámetro `json`.
* Si necesitas enviar *Form Data* en lugar de JSON, usa el parámetro `data` en su lugar.
* Para pasar *headers*, usa un `dict` en el parámetro `headers`.
* Para *cookies*, un `dict` en el parámetro `cookies`.

```python
from fastapi import UploadFile
```

::: fastapi.UploadFile
    options:
        members:
            - file
            - filename
            - size
            - headers
            - content_type
            - read
            - write
            - seek

    chain and an untrusted-but-pinned chain.
 *  Upgrade: [Kotlin 1.6.10][kotlin_1_6_10].


## Version 5.0.0-alpha.3

_2021-11-22_

 *  Fix: Change `Headers.toString()` to redact authorization and cookie headers.
 *  Fix: Don't do DNS to get the hostname for `RecordedRequest.requestUrl`. This was doing a DNS
    lookup for the local hostname, but we really just wanted the `Host` header.

Вы можете использовать **Pydantic-модели** для объявления **query-параметров** в **FastAPI**. 😎

/// tip | Совет

Спойлер: вы также можете использовать Pydantic-модели для группировки кук (cookies) и заголовков (headers), но об этом вы прочитаете позже. 🤫

import java.util.concurrent.TimeUnit

/**
 * Observes, modifies, and potentially short-circuits requests going out and the corresponding
 * responses coming back in. Typically interceptors add, remove, or transform headers on the request
 * or response.
 *
 * Implementations of this interface throw [IOException] to signal connectivity failures. This
 * includes both natural exceptions such as unreachable servers, as well as synthetic exceptions

  val method: String? by option("-X", "--request").help("Specify request command to use")

  val data: String? by option("-d", "--data").help("HTTP POST data")

  val headers: List<String>? by option("-H", "--header").help("Custom header to pass to server").multiple()

  val userAgent: String by option(
    "-A",
    "--user-agent",
  ).help(
    "User-Agent to send to server",

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

/**
 * Filter for handling Cross-Origin Resource Sharing (CORS) requests.
 * Processes CORS headers and handles preflight OPTIONS requests.
 */
public class CorsFilter implements Filter {

    /**
     * Creates a new instance of CorsFilter.
     */
    public CorsFilter() {
        // Default constructor