There are multiple tools that you can use to create those dependables, and they get integrated into OpenAPI so they are shown in the automatic docs UI, they can be used by automatically generated clients and SDKs, etc.

You can import them from `fastapi.security`:

```python
from fastapi.security import (
    APIKeyCookie,
    APIKeyHeader,

   *
   * @since 20.0
   */
  public static final String FORWARDED = "Forwarded";
  /**
   * The HTTP {@code Follow-Only-When-Prerender-Shown} header field name.
   *
   * @since 17.0
   */
  public static final String FOLLOW_ONLY_WHEN_PRERENDER_SHOWN = "Follow-Only-When-Prerender-Shown";
  /** The HTTP {@code Host} header field name. */
  public static final String HOST = "Host";
  /**

<img src="/img/tutorial/generate-clients/image01.png">

You can see those schemas because they were declared with the models in the app.

That information is available in the app's **OpenAPI schema**, and then shown in the API docs (by Swagger UI).

And that same information from the models that is included in OpenAPI is what can be used to **generate the client code**.

### Generate a TypeScript Client

All these dependencies, while declaring their requirements, also add parameters, validations, etc. to your *path operations*.

Each specific example `dict` in the `examples` can contain:

* `summary`: Short description for the example.
* `description`: A long description that can contain Markdown text.
* `value`: This is the actual example shown, e.g. a `dict`.
* `externalValue`: alternative to `value`, a URL pointing to the example. Although this might not be supported by as many tools as `value`.

You can use it like this:

=== "Python 3.10+"

|                          |                             |

## Metrics Listing

Each of the following sub-sections list metrics returned by each of the endpoints.

The standard metrics group for GoCollector is not shown below.

### `/api/requests`

| Name                                           | Type      | Help                                                    | Labels                           |

=== "Python 3.8+"

    ```Python
    {!> ../../../docs_src/sql_databases/sql_app/main.py!}
    ```

## Check it

You can copy this code and use it as is.

!!! info

    In fact, the code shown here is part of the tests. As most of the code in these docs.

Then you can run it with Uvicorn:


<div class="termy">

```console
$ uvicorn sql_app.main:app --reload

* 🐛 Fix edge case with repeated aliases names not shown in OpenAPI. PR [#2351](https://github.com/tiangolo/fastapi/pull/2351) by [@klaa97](https://github.com/klaa97).

    *   Add `tf.keras.layers.AbstractRNNCell` as the preferred implementation
        for RNN cells in TF v2. User can use it to implement RNN cells with
        custom behavior.
    *   Keras training and validation curves are shown on the same plot when
        using the TensorBoard callback.
    *   Switched Keras `fit/evaluate/predict` execution to use only a single
        unified path by default unless eager execution has been explicitly