limitations under the License.

================================================================

github.com/envoyproxy/protoc-gen-validate
https://github.com/envoyproxy/protoc-gen-validate
----------------------------------------------------------------

                                 Apache License
                           Version 2.0, January 2004

app = FastAPI()

@app.get("/items/invalidnone", response_model=Union[Item, None])
def get_invalid_none():
    return None
```

This way the data will be correctly validated, you won't have an internal server error, and the documentation will also reflect that this *path operation* could return `None` (or `null` in JSON).

### Fixes