"size": "XL"
  }
}
```

#### FastAPIs `HTTPException` vs. Starlettes `HTTPException` { #fastapis-httpexception-vs-starlettes-httpexception }

**FastAPI** hat seine eigene `HTTPException`.

Und die `HTTPException`-Fehlerklasse von **FastAPI** erbt von der `HTTPException`-Fehlerklasse von Starlette.

Usarlo en tu editor es lo que realmente te muestra los beneficios de FastAPI, al ver cuán poco código tienes que escribir, todos los chequeos de tipos, autocompletado, etc.

---

## Instalar FastAPI { #install-fastapi }

El primer paso es instalar FastAPI.

Asegúrate de crear un [entorno virtual](../virtual-environments.md){.internal-link target=_blank}, actívalo, y luego **instala FastAPI**:

<div class="termy">

```console

        </span> Join the <strong>FastAPI Cloud</strong> waiting list 🚀
      </a>
    </div>
    <div class="item">
      <a class="announce-link" href="https://x.com/fastapi" target="_blank">
        <span class="twemoji">
          {% include ".icons/fontawesome/brands/x-twitter.svg" %}
        </span> Follow <strong>@fastapi</strong> on <strong>X (Twitter)</strong> to stay updated
      </a>
    </div>

import pytest
from fastapi import FastAPI
from fastapi.exceptions import FastAPIError


class NonPydanticModel:
    pass


def test_invalid_response_model_raises():
    with pytest.raises(FastAPIError):
        app = FastAPI()

        @app.get("/", response_model=NonPydanticModel)
        def read_root():
            pass  # pragma: nocover


def test_invalid_response_model_sub_type_raises():

    url: https://github.com/fastapi/fastapi/discussions/categories/questions
  - name: Feature Request
    about: To suggest an idea or ask about a feature, please start with a question saying what you would like to achieve. There might be a way to do it already.
    url: https://github.com/fastapi/fastapi/discussions/categories/questions
  - name: Show and tell
    about: Show what you built with FastAPI or to be used with FastAPI.

target="_blank">versionnage sémantique</a>.

Vous pouvez créer des applications de production avec **FastAPI** dès maintenant (et vous le faites probablement depuis un certain temps), vous devez juste vous assurer que vous utilisez une version qui fonctionne correctement avec le reste de votre code.

## Épinglez votre version de `fastapi`

Tout d'abord il faut "épingler" la version de **FastAPI** que vous utilisez à la dernière version dont vous savez

  }
}
```

#### FastAPI's `HTTPException` vs Starlette's `HTTPException` { #fastapis-httpexception-vs-starlettes-httpexception }

**FastAPI** has its own `HTTPException`.

And **FastAPI**'s `HTTPException` error class inherits from Starlette's `HTTPException` error class.

/// info | Info

Das Paket <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a> wird automatisch mit **FastAPI** installiert, wenn Sie den Befehl `pip install "fastapi[standard]"` ausführen.

Wenn Sie jedoch den Befehl `pip install fastapi` verwenden, ist das Paket `python-multipart` nicht standardmäßig enthalten.

  - type: input
    id: fastapi-version
    attributes:
      label: FastAPI Version
      description: |
        What FastAPI version are you using?

        You can find the FastAPI version with:

        ```bash
        python -c "import fastapi; print(fastapi.__version__)"
        ```
    validations:
      required: true
  - type: input

from fastapi import FastAPI, Request
from fastapi.encoders import jsonable_encoder
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse
from pydantic import BaseModel

app = FastAPI()


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
    return JSONResponse(
        status_code=422,