if (!isRecoverable(e, requestSendStarted)) return false

    // No more routes to attempt.
    if (!call.retryAfterFailure()) return false

    // For failure recovery, use the same route selector with a new connection.
    return true
  }

  private fun requestIsOneShot(
    e: IOException,
    userRequest: Request,
  ): Boolean {
    val requestBody = userRequest.body

    testApi(projectTests(":compiler:test-infrastructure-utils"))
    testApi(projectTests(":compiler:test-infrastructure"))
    testImplementation(projectTests(":compiler:tests-common-new"))
    testImplementation(projectTests(":compiler:fir:analysis-tests:legacy-fir-tests"))
    testImplementation(projectTests(":analysis:analysis-api-impl-base"))

```

!!! tip
    The `callback_url` query parameter uses a Pydantic <a href="https://docs.pydantic.dev/latest/concepts/types/#urls" class="external-link" target="_blank">URL</a> type.

The only new thing is the `callbacks=invoices_callback_router.routes` as an argument to the *path operation decorator*. We'll see what that is next.

## Documenting the callback

The actual callback code will depend heavily on your own API app.

![ReDoc](https://fastapi.tiangolo.com/img/index/index-06-redoc-02.png)

### Just Modern Python

It's all based on standard **Python type** declarations (thanks to Pydantic). No new syntax to learn. Just standard modern Python.

If you need a 2 minute refresher of how to use Python types (even if you don't use FastAPI), check the short tutorial: [Python Types](python-types.md){.internal-link target=_blank}.

如果您选择 "Watching" 而不是 "Releases only"，有人创建新 Issue 时，您会接收到通知。

然后您就可以尝试并帮助他们解决问题。

## 创建 Issue

您可以在 GitHub 资源库中<a href="https://github.com/tiangolo/fastapi/issues/new/choose" class="external-link" target="_blank">创建 Issue</a>，例如：

* 提出**问题**或**意见**
* 提出新**特性**建议

**注意**：如果您创建 Issue，我会要求您也要帮助别的用户。😉

## 创建 PR

<blockquote markdown="1">

**FastAPI** wouldn't exist if not for the previous work of others.

There have been many tools created before that have helped inspire its creation.

I have been avoiding the creation of a new framework for several years. First I tried to solve all the features covered by **FastAPI** using many different frameworks, plug-ins, and tools.

Contributing
------------

If you are interested in the development of Maven, please consult the
documentation first and afterward you are welcome to join the developers
mailing list to ask questions or discuss new ideas/features/bugs etc.

Take a look into the [contribution guidelines](CONTRIBUTING.md).

License
-------
This code is under the [Apache License, Version 2.0, January 2004][license].

    ```

### Declare the dependency, in the "dependant"

The same way you use `Body`, `Query`, etc. with your *path operation function* parameters, use `Depends` with a new parameter:

=== "Python 3.10+"

    ```Python hl_lines="13  18"
    {!> ../../../docs_src/dependencies/tutorial001_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="15  20"

  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastUpdateTime = 4;

  // lastTransitionTime is the time the condition last transitioned from one status to another.
  // If unset, when a new condition type is added or an existing condition's status is changed,
  // the server defaults this to the current time.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 5;
}

Der nächste Schritt besteht darin, das Skript auszuführen, um ein neues Übersetzungsverzeichnis zu erstellen:

<div class="termy">

```console
// Verwenden Sie das Kommando new-lang und fügen Sie den Sprach-Code als Argument hinten an
$ python ./scripts/docs.py new-lang ht

Successfully initialized: docs/ht
```

</div>

Jetzt können Sie in Ihrem Code-Editor das neu erstellte Verzeichnis `docs/ht/` sehen.