experience performance degradation if they had been improperly allowing an
excessive amount of idle connections to linger; usually by setting
[Transport.MaxIdleConns] to `0` or using different [Client]s for different
requests, thereby bypassing [Transport.MaxIdleConns] limit. In these cases,
setting [Transport.DisableKeepAlives] to `true` will disable connection reuse.
However, such performance degradation usually indicates improper configuration

                This prevents potential cross-site request forgery (CSRF) attacks
                that exploit the browser's ability to send requests without a
                Content-Type header, bypassing CORS preflight checks. In particular
                applicable for apps that need to be run locally (in localhost).

                When `False`, requests without a `Content-Type` header will have

                This prevents potential cross-site request forgery (CSRF) attacks
                that exploit the browser's ability to send requests without a
                Content-Type header, bypassing CORS preflight checks. In particular
                applicable for apps that need to be run locally (in localhost).

                When `False`, requests without a `Content-Type` header will have

{* ../../docs_src/behind_a_proxy/tutorial002_py310.py hl[3] *}

Passing the `root_path` to `FastAPI` would be the equivalent of passing the `--root-path` command line option to Uvicorn or Hypercorn.

### About `root_path` { #about-root-path }

Keep in mind that the server (Uvicorn) won't use that `root_path` for anything else than passing it to the app.

):
    # This is an incorrect way of using it, this is not checking if the scopes are
    # provided by the token, only if the endpoint is requesting them, but the test
    # here is just to check if FastAPI is indeed registering and passing the scopes
    # correctly when using Security with parameterless dependencies.
    if "a" not in security_scopes.scopes or "b" not in security_scopes.scopes:

UserInDB(**user_dict)
```

would be equivalent to:

```Python
UserInDB(**user_in.model_dump())
```

...because `user_in.model_dump()` is a `dict`, and then we make Python "unpack" it by passing it to `UserInDB` prefixed with `**`.

So, we get a Pydantic model from the data in another Pydantic model.

#### Unpacking a `dict` and extra keywords { #unpacking-a-dict-and-extra-keywords }

If everything is working, or after you make the necessary changes, and all your tests are passing, then you can pin your `fastapi` to that new recent version.

## About Starlette { #about-starlette }

You shouldn't pin the version of `starlette`.

<img src="/img/tutorial/path-operation-configuration/image05.png">

## Recap { #recap }

## FastAPI People PRs

Every month, a GitHub Action updates the FastAPI People data. Those PRs look like this one: [👥 Update FastAPI People](https://github.com/fastapi/fastapi/pull/11669).

If the tests are passing, you can merge it right away.

## Dependabot PRs

Dependabot will create PRs to update dependencies for several things, and those PRs all look similar, but some are way more delicate than others.

For those cases, you can use the `jsonable_encoder` to convert your data before passing it to a response:

{* ../../docs_src/response_directly/tutorial001_py310.py hl[5:6,20:21] *}

/// note | Technical Details

You could also use `from starlette.responses import JSONResponse`.