import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.jspecify.annotations.Nullable;

/**
 * A {@link ListenableFuture} that supports fluent chains of operations. For example:
 *
 * {@snippet :
 * ListenableFuture<Boolean> adminIsLoggedIn =
 *     FluentFuture.from(usersDatabase.getAdminUser())
 *         .transform(User::getId, directExecutor())

Далі ви б запустили сервер, передаючи конфігурації як змінні оточення, наприклад, ви можете встановити `ADMIN_EMAIL` і `APP_NAME` так:

<div class="termy">

```console
$ ADMIN_EMAIL="deadpool@example.com" APP_NAME="ChimichangApp" fastapi run main.py

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

/// tip | Порада

A GODEBUG setting is a `key=value` pair
that controls the execution of certain parts of a Go program.
The environment variable `GODEBUG`
can hold a comma-separated list of these settings.
For example, if a Go program is running in an environment that contains

	GODEBUG=http2client=0,http2server=0

then that Go program will disable the use of HTTP/2 by default in both
the HTTP client and the HTTP server.

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example.group</groupId>
  <artifactId>valid-version-sha1</artifactId>
  <version>${revision}${changelist}${sha1}</version>

  <description>
    This will test if the validation for the ci friendly versions
    is working correct.

    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="john@example.com", full_name="John Doe"
    )


async def get_current_user(token: str = Depends(oauth2_scheme)):
    user = fake_decode_token(token)
    return user


@app.get("/users/me")

# Header 4 { #header-4 }

Link to anchor: <a href="#header-2">Header 2</a>

# Header with <a href="http://example.com">link</a> { #header-with-link }

Please first search existing issues for the feature you are requesting;
it may already exist, even as a closed issue.
-->

<!--
Describe the feature.

Please give us as much context as possible about the feature. For example,
you could include a story about a time when you wanted to use the feature,
and also tell us what you had to do instead. The last part is helpful
because it gives us an idea of how much harder your life is without the
feature.

Another link: [**FastAPI** Project Generators](project-generation.md "Link title"){.internal-link target=_blank} with title.

# Header 4 { #header-4 }

Link to anchor: [Header 2](#header-2)

# Header with [link](http://example.com) { #header-with-link }

    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="john@example.com", full_name="John Doe"
    )


async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
    user = fake_decode_token(token)
    return user


@app.get("/users/me")

```console
$ fastapi dev main.py
```

But you would have to remember to pass the correct path every time you call the `fastapi` command.

Additionally, other tools might not be able to find it, for example the [VS Code Extension](editor-support.md) or [FastAPI Cloud](https://fastapicloud.com), so it is recommended to use the `entrypoint` in `pyproject.toml`.

## `fastapi dev` { #fastapi-dev }