.build()
  }

  @Test
  fun http2OneBadHostOneGoodNoRetryOnConnectionFailure() {
    enableProtocol(Protocol.HTTP_2)

    val request = Request(server1.url("/"))

    server1.enqueue(refusedStream)
    server2.enqueue(bodyResponse)

    dns[server1.hostName] = listOf(ipv6, ipv4)
    socketFactory[ipv6] = server1.inetSocketAddress

::: fastapi.WebSocket
    options:
        members:
            - scope
            - app
            - url
            - base_url
            - headers
            - query_params
            - path_params
            - cookies
            - client
            - state
            - url_for
            - client_state
            - application_state
            - receive
            - send

    {!> ../../../docs_src/security/tutorial001.py!}
    ```

!!! tip "Подсказка"
    Здесь `tokenUrl="token"` ссылается на относительный URL `token`, который мы еще не создали. Поскольку это относительный URL, он эквивалентен `./token`.

    本例中，**FastAPI** 还提供了构建工具。

创建 `OAuth2PasswordBearer` 的类实例时，要传递 `tokenUrl` 参数。该参数包含客户端（用户浏览器中运行的前端） 的 URL，用于发送 `username` 与 `password`，并获取令牌。

```Python hl_lines="6"
{!../../../docs_src/security/tutorial001.py!}
```

!!! tip "提示"

    在此，`tokenUrl="token"` 指向的是暂未创建的相对 URL `token`。这个相对 URL 相当于 `./token`。

    val headerBlock =
      headersOf(
        ":status",
        "200 OK",
        ":version",
        "HTTP/1.1",
        "connection",
        "close",
      )
    val request = Request.Builder().url("http://square.com/").build()
    val response = readHttp2HeadersList(headerBlock, Protocol.HTTP_2).request(request).build()
    val headers = response.headers
    assertThat(headers.size).isEqualTo(1)

   * check callers should also confirm that this cookie has not expired.
   */
  fun matches(url: HttpUrl): Boolean {
    val domainMatch =
      if (hostOnly) {
        url.host == domain
      } else {
        domainMatch(url.host, domain)
      }
    if (!domainMatch) return false

    if (!pathMatch(url, path)) return false

        !connection.noNewExchanges -> null

        !connection.route().address.url.canReuseConnectionFor(address.url) -> null

        else -> connection.route()
      }
    }
  }

  override fun sameHostAndPort(url: HttpUrl): Boolean {
    val routeUrl = address.url
    return url.port == routeUrl.port && url.host == routeUrl.host
  }

It will have a *path operation* that will receive an `Invoice` body, and a query parameter `callback_url` that will contain the URL for the callback.

This part is pretty normal, most of the code is probably already familiar to you:

```Python hl_lines="9-13  36-53"
{!../../../docs_src/openapi_callbacks/tutorial001.py!}
```

!!! tip

supports both synchronous blocking calls and async calls with callbacks.


Get a URL
---------

This program downloads a URL and prints its contents as a string. [Full source][get_example].

```java
OkHttpClient client = new OkHttpClient();

String run(String url) throws IOException {
  Request request = new Request.Builder()
      .url(url)
      .build();

  try (Response response = client.newCall(request).execute()) {

```

La partie appelée requête (ou **query**) dans une URL est l'ensemble des paires clés-valeurs placées après le `?` , séparées par des `&`.

Par exemple, dans l'URL :

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

...les paramètres de requête sont :

* `skip` : avec une valeur de`0`
* `limit` : avec une valeur de `10`

Faisant partie de l'URL, ces valeurs sont des chaînes de caractères (`str`).