import static java.lang.annotation.RetentionPolicy.RUNTIME;

import com.google.common.annotations.GwtCompatible;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * Annotates a "top-level" type-variable usage that takes its nullness from the type argument
 * supplied by the user of the class. For example, {@code Multiset.Entry.getElement()} returns

_LINK, e => {\n      e.preventDefault()\n      this.onTabClick(e.target)\n      this.switchTab(e.target)\n    })\n    $(document).on('click', SELECTOR_DATA_TOGGLE_CLOSE, e => {\n      e.preventDefault()\n      let { target } = e\n\n      if (target.nodeName == 'I') {\n        target = e.target.offsetParent\n      }\n\n      this.removeActiveTab(target.attributes['data-type'] ? target.attributes['data-type'].nodeValue : null, target)\n    })\n    $(document).on('click', SELECTOR_DATA_TOGGLE_FULLSCREEN,...

```Python hl_lines="27-31"
{!../../docs_src/app_testing/tutorial002.py!}
```

/// note | "Not"

Daha fazla detay için Starlette'in <a href="https://www.starlette.io/staticfiles/" class="external-link" target="_blank">Websockets'i Test Etmek</a> dokümantasyonunu inceleyin.

    * Sie können auch [`Security`-Abhängigkeiten mit `scopes`](../advanced/security/oauth2-scopes.md){.internal-link target=_blank} hinzufügen.

/// tip | "Tipp"

				default:
					err = dc.Skip()
					if err != nil {
						err = msgp.WrapError(err, "Flags")
						return
					}
				}
			}
		case "Target":
			err = z.Target.DecodeMsg(dc)
			if err != nil {
				err = msgp.WrapError(err, "Target")
				return
			}
		case "Source":
			err = z.Source.DecodeMsg(dc)
			if err != nil {
				err = msgp.WrapError(err, "Source")
				return
			}

En versiones anteriores de NodeJS / Browser JavaScript, habrías utilizado "callbacks". Lo que conduce a <a href="http://callbackhell.com/" class="external-link" target="_blank">callback hell</a>.

## Coroutines

 *
 * <ul>
 *   <li><a target="_parent"
 *       href="http://en.wikipedia.org/wiki/Bogon_filtering">http://en.wikipedia.
 *       org/wiki/Bogon_filtering</a>
 *   <li><a target="_parent"
 *       href="http://www.cymru.com/Bogons/ipv6.txt">http://www.cymru.com/Bogons/ ipv6.txt</a>
 *   <li><a target="_parent" href="http://www.cymru.com/Bogons/v6bogon.html">http://www.cymru.com/

            "type" : "keyword"
          },
          "scriptType" : {
            "type" : "keyword"
          },
          "sortOrder" : {
            "type" : "integer"
          },
          "target" : {
            "type" : "keyword"
          },
          "updatedBy" : {
            "type" : "keyword"
          },
          "updatedTime" : {
            "type" : "long"
          }
        }
      }

Но в реальных проектах, при внедрении системы безопасности, вы получите больше пользы используя интегрированные [средства защиты (следующая глава)](../security/index.md){.internal-link target=_blank}.

///

## Исключения в dependencies и возвращаемые значения

Вы можете использовать те же *функции* зависимостей, что и обычно.

### Требования к зависимостям

For example, let's add <a href="https://github.com/Rebilly/ReDoc/blob/master/docs/redoc-vendor-extensions.md#x-logo" class="external-link" target="_blank">ReDoc's OpenAPI extension to include a custom logo</a>.

### Normal **FastAPI**

First, write all your **FastAPI** application as normally:

{* ../../docs_src/extending_openapi/tutorial001.py hl[1,4,7:9] *}