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  2. github.com/tiangolo/fastapi

    docs/de/docs/reference/exceptions.md 

    Sie können Folgendes verwenden:

* `HTTPException`
* `WebSocketException`

Diese Exceptions können direkt von `fastapi` importiert werden:

```python
from fastapi import HTTPException, WebSocketException
```

::: fastapi.HTTPException
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  3. github.com/tiangolo/fastapi

    docs_src/websockets/tutorial002_py310.py 

    from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
    Python
    - Registered: Sun Apr 28 07:19:10 GMT 2024
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
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    - Viewed (0)
  4. github.com/tiangolo/fastapi

    docs/en/docs/reference/exceptions.md 

    # Exceptions - `HTTPException` and `WebSocketException`

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`
    Plain Text
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  5. github.com/tiangolo/fastapi

    fastapi/__init__.py 

    from .background import BackgroundTasks as BackgroundTasks
from .datastructures import UploadFile as UploadFile
from .exceptions import HTTPException as HTTPException
from .exceptions import WebSocketException as WebSocketException
from .param_functions import Body as Body
from .param_functions import Cookie as Cookie
from .param_functions import Depends as Depends
from .param_functions import File as File
    Python
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  6. github.com/tiangolo/fastapi

    docs_src/websockets/tutorial002_an_py310.py 

    from typing import Annotated

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
    Python
    - Registered: Sun Apr 28 07:19:10 GMT 2024
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
    - 2.8K bytes
    - Viewed (0)
  7. github.com/tiangolo/fastapi

    fastapi/exceptions.py 

            FastAPI,
        WebSocket,
        WebSocketException,
        status,
    )

    app = FastAPI()

    @app.websocket("/items/{item_id}/ws")
    async def websocket_endpoint(
        *,
        websocket: WebSocket,
        session: Annotated[str | None, Cookie()] = None,
        item_id: str,
    ):
        if session is None:
            raise WebSocketException(code=status.WS_1008_POLICY_VIOLATION)
    Python
    - Registered: Sun Apr 28 07:19:10 GMT 2024
    - Last Modified: Tue Apr 02 02:48:51 GMT 2024
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  8. github.com/tiangolo/fastapi

    docs_src/websockets/tutorial002.py 

    from typing import Union

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
    Python
    - Registered: Sun Apr 28 07:19:10 GMT 2024
    - Last Modified: Sun Nov 13 16:10:54 GMT 2022
    - 2.8K bytes
    - Viewed (0)
  9. github.com/tiangolo/fastapi

    docs_src/websockets/tutorial002_an.py 

    from typing import Union

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse
from typing_extensions import Annotated

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
    Python
    - Registered: Sun Apr 28 07:19:10 GMT 2024
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
    - 2.8K bytes
    - Viewed (0)
  10. github.com/tiangolo/fastapi

    docs_src/websockets/tutorial002_an_py39.py 

    from typing import Annotated, Union

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
    Python
    - Registered: Sun Apr 28 07:19:10 GMT 2024
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
    - 2.8K bytes
    - Viewed (0)
  11. github.com/tiangolo/fastapi

    docs/en/docs/advanced/websockets.md 

        ```Python hl_lines="68-69  81"
    {!> ../../../docs_src/websockets/tutorial002.py!}
    ```

!!! info
    As this is a WebSocket it doesn't really make sense to raise an `HTTPException`, instead we raise a `WebSocketException`.

    You can use a closing code from the <a href="https://tools.ietf.org/html/rfc6455#section-7.4.1" class="external-link" target="_blank">valid codes defined in the specification</a>.
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