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## Override the default exception handlers

**FastAPI** has some default exception handlers.

These handlers are in charge of returning the default JSON responses when you `raise` an `HTTPException` and when the request has invalid data.

You can override these exception handlers with your own.

### Override request validation exceptions

Nevertheless, we can declare the expected schema for the request body.

### Custom OpenAPI content type

And then the Gunicorn-compatible **Uvicorn worker** class would be in charge of converting the data sent by Gunicorn to the ASGI standard for FastAPI to use it.

## Install Gunicorn and Uvicorn

<div class="termy">

```console
$ pip install "uvicorn[standard]" gunicorn

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