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internal/grid/handlers.go

	nilReq         Req
	nilResp        Resp
	sharedResponse bool
}

// NewStream creates a typed handler that can provide Marshal/Unmarshal.
// Use Register to register a server handler.
// Use Call to initiate a clientside call.
// newPayload can be nil. In that case payloads will always be nil.
// newReq can be nil. In that case no input stream is expected and the handler will be called with nil 'in' channel.

Created: Sun Apr 05 19:28:12 GMT 2026

- Last Modified: Tue Feb 18 16:25:55 GMT 2025

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github.com/tiangolo/fastapi

docs_src/websockets_/tutorial003_py310.py

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <h2>Your ID: <span id="ws-id"></span></h2>
        <form action="" onsubmit="sendMessage(event)">
            <input type="text" id="messageText" autocomplete="off"/>
            <button>Send</button>
        </form>
        <ul id='messages'>

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Fri Feb 27 12:34:37 GMT 2026

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github.com/tiangolo/fastapi

.github/DISCUSSION_TEMPLATE/questions.yml

    attributes:
      label: Operating System Details
      description: You can add more details about your operating system here, in particular if you chose "Other".
  - type: input
    id: fastapi-version
    attributes:
      label: FastAPI Version
      description: |
        What FastAPI version are you using?

        You can find the FastAPI version with:

        ```bash

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Thu Aug 03 15:59:41 GMT 2023

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github.com/tiangolo/fastapi

docs/en/docs/tutorial/request-forms.md

For example, in one of the ways the OAuth2 specification can be used (called "password flow") it is required to send a `username` and `password` as form fields.

The <dfn title="specification">spec</dfn> requires the fields to be exactly named `username` and `password`, and to be sent as form fields, not JSON.

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Thu Mar 05 18:13:19 GMT 2026

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github.com/tiangolo/fastapi

fastapi/security/oauth2.py


class SecurityScopes:
    """
    This is a special class that you can define in a parameter in a dependency to
    obtain the OAuth2 scopes required by all the dependencies in the same chain.

    This way, multiple dependencies can have different scopes, even when used in the
    same *path operation*. And with this, you can access all the scopes required in
    all those dependencies in a single place.

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Tue Mar 24 16:32:10 GMT 2026

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github.com/tiangolo/fastapi

docs/en/docs/advanced/security/oauth2-scopes.md

/// warning

This is a more or less advanced section. If you are just starting, you can skip it.

You don't necessarily need OAuth2 scopes, and you can handle authentication and authorization however you want.

But OAuth2 with scopes can be nicely integrated into your API (with OpenAPI) and your API docs.

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Thu Mar 05 18:13:19 GMT 2026

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github.com/tiangolo/fastapi

docs/en/docs/reference/exceptions.md

These are the exceptions that you can raise to show errors to the client.

When you raise an exception, as would happen with normal Python, the rest of the execution is aborted. This way you can raise these exceptions from anywhere in the code to abort a request and show the error to the client.

You can use:

* `HTTPException`
* `WebSocketException`

These exceptions can be imported directly from `fastapi`:

```python

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Thu Apr 18 19:53:19 GMT 2024

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github.com/tiangolo/fastapi

docs/es/docs/advanced/sub-applications.md

### Revisa la documentación automática de la API { #check-the-automatic-api-docs }

Ahora, ejecuta el comando `fastapi`:

<div class="termy">

```console
$ fastapi dev

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Y abre la documentación en [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs).

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Thu Mar 19 18:15:55 GMT 2026

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github.com/tiangolo/fastapi

docs/pt/docs/advanced/sub-applications.md

### Verifique a documentação automática da API { #check-the-automatic-api-docs }

Agora, execute o comando `fastapi`:

<div class="termy">

```console
$ fastapi dev

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

E abra a documentação em [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs).

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Thu Mar 19 18:20:43 GMT 2026

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github.com/tiangolo/fastapi

docs/zh-hant/docs/how-to/conditional-openapi.md

接著在建立 `FastAPI` 應用時使用它。

然後你可以將環境變數 `OPENAPI_URL` 設為空字串，以停用 OpenAPI（包含文件 UI），如下：

<div class="termy">

```console
$ OPENAPI_URL= uvicorn main:app

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

之後若你造訪 `/openapi.json`、`/docs` 或 `/redoc`，會看到如下的 `404 Not Found` 錯誤：

```JSON
{
    "detail": "Not Found"
}

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Fri Mar 20 17:05:38 GMT 2026

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