{* ../../docs_src/path_operation_configuration/tutorial004_py310.py hl[17:25] *}

It will be used in the interactive docs:

<img src="/img/tutorial/path-operation-configuration/image02.png">

## Response description { #response-description }

You can specify the response description with the parameter `response_description`:

  alias realpath=grealpath
  alias stat=gstat
  # By default, aliases are only expanded in interactive shells, which means
  # that they are not substituted for their corresponding commands in shell
  # scripts. By setting "expand_aliases", we enable alias expansion in
  # non-interactive shells as well.
  shopt -s expand_aliases
else
  echo '==TFCI==: Error: Cannot find path to grealpath or gstat'

```console
$ fastapi dev

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

</div>

## Check it { #check-it }

Go to the interactive docs at: [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs).

You will see something like this:

<img src="/img/tutorial/security/image01.png">

/// check | Authorize button!

You will see the JSON response as:

```JSON
{"message": "Hello World"}
```

### Interactive API docs { #interactive-api-docs }

Now go to [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs).

You will see the automatic interactive API documentation (provided by [Swagger UI](https://github.com/swagger-api/swagger-ui)):

 *
 * <p>Key features include:</p>
 * <ul>
 *   <li>Project upgrade capabilities</li>
 *   <li>Dependency version management</li>
 *   <li>Configuration migration</li>
 *   <li>Interactive upgrade workflows</li>
 * </ul>
 *
 * @see org.apache.maven.api.cli.Tools#MVNUP_CMD
 * @see org.apache.maven.api.cli.Tools#MVNUP_NAME
 * @since 4.0.0
 */

  private var failFastResponse: MockResponse? = null

  @Throws(InterruptedException::class)
  override fun dispatch(request: RecordedRequest): MockResponse {
    // To permit interactive/browser testing, ignore requests for favicons.
    val requestLine = request.requestLine
    if (requestLine == "GET /favicon.ico HTTP/1.1") {
      logger.info("served $requestLine")

And when you open your browser at [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs), you will see an automatic, interactive, API documentation like:

<img src="/img/tutorial/path-params/image01.png">

/// check

Again, just with that same Python type declaration, **FastAPI** gives you automatic, interactive documentation (integrating Swagger UI).

Notice that the path parameter is declared to be an integer.

///

Vous verrez la réponse JSON suivante :

```JSON
{"message": "Hello World"}
```

### Documentation interactive de l’API { #interactive-api-docs }

Allez maintenant sur [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs).

Vous verrez la documentation interactive de l’API générée automatiquement (fournie par [Swagger UI](https://github.com/swagger-api/swagger-ui)) :

    Optional<String> failOnSeverity();

    /**
     * Indicates whether to run in non-interactive mode.
     *
     * @return an {@link Optional} containing the boolean flag, or empty if not set
     */
    @Nonnull
    Optional<Boolean> nonInteractive();

    /**
     * Indicates whether to force interactive mode.
     *
     * @return an {@link Optional} containing the boolean flag, or empty if not set

### Automatic docs { #automatic-docs }

Interactive API documentation and exploration web user interfaces. As the framework is based on OpenAPI, there are multiple options, 2 included by default.

* [**Swagger UI**](https://github.com/swagger-api/swagger-ui), with interactive exploration, call and test your API directly from the browser.

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)