}
}
```

/// tip | Consejo

Observa el server auto-generado con un valor `url` de `/api/v1`, tomado del `root_path`.

///

En la UI de los docs en <a href="http://127.0.0.1:9999/api/v1/docs" class="external-link" target="_blank">http://127.0.0.1:9999/api/v1/docs</a> se vería como:

<img src="/img/tutorial/behind-a-proxy/image03.png">

/// tip | Consejo

Y entonces **FastAPI** llamará a esa dependencia para sobreescribir en lugar de la dependencia original.

{* ../../docs_src/dependency_testing/tutorial001_an_py310.py hl[26:27,30] *}

/// tip | Consejo

Puedes sobreescribir una dependencia utilizada en cualquier lugar de tu aplicación **FastAPI**.

And then **FastAPI** will call that override instead of the original dependency.

{* ../../docs_src/dependency_testing/tutorial001_an_py310.py hl[26:27,30] *}

/// tip

You can set a dependency override for a dependency used anywhere in your **FastAPI** application.

# Environment Variables { #environment-variables }

/// tip

If you already know what "environment variables" are and how to use them, feel free to skip this.

///

An environment variable (also known as "**env var**") is a variable that lives **outside** of the Python code, in the **operating system**, and could be read by your Python code (or by other programs as well).

Vous devriez le faire après avoir ajouté toutes vos *paramètres de chemin*.

{* ../../docs_src/path_operation_advanced_configuration/tutorial002.py hl[2,12:21,24] *}

/// tip | Astuce

Si vous appelez manuellement `app.openapi()`, vous devez mettre à jour les `operationId` avant.

///

/// warning | Attention

# Gelişmiş Güvenlik

## Ek Özellikler

[Tutorial - User Guide: Security](../../tutorial/security/index.md){.internal-link target=_blank} sayfasında ele alınanların dışında güvenlikle ilgili bazı ek özellikler vardır.

/// tip | İpucu

Sonraki bölümler **mutlaka "gelişmiş" olmak zorunda değildir**.

Kullanım şeklinize bağlı olarak, çözümünüz bu bölümlerden birinde olabilir.

///

## Önce Öğreticiyi Okuyun

But now, having `Query(max_length=50)` inside of `Annotated`, we are telling FastAPI that we want it to have **additional validation** for this value, we want it to have maximum 50 characters. 😎

/// tip

Here we are using `Query()` because this is a **query parameter**. Later we will see others like `Path()`, `Body()`, `Header()`, and `Cookie()`, that also accept the same arguments as `Query()`.

///

/// info | Додаткова інформація

<a href="https://docs.python.org/3/library/enum.html" class="external-link" target="_blank">Перелічення (або enums) доступні в Python</a> починаючи з версії 3.4.

///

/// tip | Порада

Якщо вам цікаво, "AlexNet", "ResNet" та "LeNet" — це просто назви ML моделей <abbr title="Технічно, архітектури Deep Learning моделей">Machine Learning</abbr>.

///


### Оголосіть *параметр шляху*

# 如何操作 - 诀窍

在这里，你将看到关于**多个主题**的不同诀窍或“如何操作”指南。

这些方法多数是**相互独立**的，在大多数情况下，你只需在这些内容适用于**你的项目**时才需要学习它们。

如果某些内容看起来对你的项目有用，请继续查阅，否则请直接跳过它们。

/// tip | 小技巧

如果你想以系统的方式**学习 FastAPI**（推荐），请阅读 [教程 - 用户指南](../tutorial/index.md){.internal-link target=_blank} 的每一章节。

* Также имеется возможность видоизменить `response`, перед тем как его вернуть.

{* ../../docs_src/middleware/tutorial001_py39.py hl[8:9,11,14] *}

/// tip | Примечание

Имейте в виду, что можно добавлять свои собственные заголовки <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers" class="external-link" target="_blank">при помощи префикса 'X-'</a>.