import java.io.IOException
import okhttp3.OkHttpClient
import okhttp3.Request

class AccessHeaders {
  private val client = OkHttpClient()

  fun run() {
    val request =
      Request.Builder()
        .url("https://api.github.com/repos/square/okhttp/issues")
        .header("User-Agent", "OkHttp Headers.java")
        .addHeader("Accept", "application/json; q=0.5")
        .addHeader("Accept", "application/vnd.github.v3+json")

当你使用 `Query` 显式地定义查询参数时，你还可以声明它去接收一组值，或换句话来说，接收多个值。

例如，要声明一个可在 URL 中出现多次的查询参数 `q`，你可以这样写：

```Python hl_lines="9"
{!../../docs_src/query_params_str_validations/tutorial011.py!}
```

然后，输入如下网址：

```
http://localhost:8000/items/?q=foo&q=bar
```

你会在*路径操作函数*的*函数参数* `q` 中以一个 Python `list` 的形式接收到*查询参数* `q` 的多个值（`foo` 和 `bar`）。

因此，该 URL 的响应将会是：

```JSON
{
  "q": [
    "foo",
    "bar"

# FORMAT NOT DOCUMENTED YET (parser is urltestparser.js)

# Based on http://trac.webkit.org/browser/trunk/LayoutTests/fast/url/script-tests/segments.js
http://example\t.\norg http://example.org/foo/bar s:http h:example.org p:/
http://user:pass@foo:21/bar;par?b#c  s:http u:user pass:pass h:foo port:21 p:/bar;par q:?b f:#c
http:foo.com  s:http h:example.org p:/foo/foo.com
\t\s\s\s:foo.com\s\s\s\n  s:http h:example.org p:/foo/:foo.com

                  .add("publicobject.com", "sha256/afwiKY3RxoMmLkuRW1l7QsPZTJPwDS2pdDROQjXw8ig=")
                  .build())
          .build()

      fun run() {
        val request = Request.Builder()
            .url("https://publicobject.com/robots.txt")
            .build()

        client.newCall(request).execute().use { response ->
          if (!response.isSuccessful) throw IOException("Unexpected code $response")

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

The `callback_url` query parameter uses a Pydantic <a href="https://docs.pydantic.dev/latest/api/networks/" class="external-link" target="_blank">Url</a> type.

///

    "tax": 3.2,
    "tags": [
        "rock",
        "metal",
        "bar"
    ],
    "images": [
        {
            "url": "http://example.com/baz.jpg",
            "name": "The Foo live"
        },
        {
            "url": "http://example.com/dave.jpg",
            "name": "The Baz"
        }
    ]
}
```

/// info | "정보"

    "paid": true
}
```

e esperaria uma resposta daquela *API externa* com um corpo JSON como:

```JSON
{
    "ok": true
}
```

/// tip | Dica

Perceba como a URL de callback usada contém a URL recebida como um parâmetro de consulta em `callback_url` (`https://www.external.org/events`) e também o `id` da fatura de dentro do corpo JSON (`2expen51ve`).

///

### Adicionar o roteador de callback

Awesome 5 Brands";font-style:normal;font-weight:normal;font-display:auto;src:url(./fonts/fa-brands-400.eot);src:url(./fonts/fa-brands-400.eot?#iefix) format("embedded-opentype"),url(./fonts/fa-brands-400.woff2) format("woff2"),url(./fonts/fa-brands-400.woff) format("woff"),url(./fonts/fa-brands-400.ttf) format("truetype"),url(./fonts/fa-brands-400.svg#fontawesome) format("svg")}.fab{font-family:"Font Awesome 5 Brands"}@font-face{font-family:"Font Awesome 5 Free";font-style:normal;font-weight:400;fo...

/**
 * ArtifactRepositoryLayout2
 */
public interface ArtifactRepositoryLayout2 extends ArtifactRepositoryLayout {

    ArtifactRepository newMavenArtifactRepository(
            String id, String url, ArtifactRepositoryPolicy snapshots, ArtifactRepositoryPolicy releases);

/**
 * @author shinsuke
 *
 */
public interface UrlQueueService<QUEUE extends UrlQueue<?>> {

    void updateSessionId(String oldSessionId, String newSessionId);

    void add(String sessionId, String url);

    void insert(QUEUE urlQueue);

    void delete(String sessionId);

    void deleteAll();

    void offerAll(String sessionId, List<QUEUE> newUrlQueueList);

    QUEUE poll(String sessionId);