# Dependencies - `Depends()` and `Security()`

## `Depends()`

Dependencies are handled mainly with the special function `Depends()` that takes a callable.

Here is the reference for it and its parameters.

You can import it directly from `fastapi`:

```python
from fastapi import Depends
```

::: fastapi.Depends

## `Security()`

    Any HTTP (error) status code 401 "UNAUTHORIZED" is supposed to also return a `WWW-Authenticate` header.

    In the case of bearer tokens (our case), the value of that header should be `Bearer`.

    You can actually skip that extra header and it would still work.

    But it's provided here to be compliant with the specifications.

    val testTaskOptionsParameterName = "testTaskOptions"
    val daemon = true
    applyDefaultSettings(os, arch, buildJvm = BuildToolBuildJvm, timeout = 0)

    // Show all failed tests here, since that is what we are interested in
    failureConditions.supportTestRetry = false

    val extraParameters = functionalTestExtraParameters("RerunFlakyTest", os, arch, "%$testJvmVersionParameter%", "%$testJvmVendorParameter%")

<img src="/img/tutorial/custom-response/image01.png">

## Available responses

Here are some of the available responses.

Keep in mind that you can use `Response` to return anything else, or even create a custom sub-class.

!!! note "Technical Details"

            if (hasParentPsi(symbol)) {
                // getSymbol(ClassId) returns a symbol from the original file, so here we avoid using it
                return getContainingDeclarationByPsi(symbol)
            }
        }

        when (symbol) {
            is KtLocalVariableSymbol,
            is KtAnonymousFunctionSymbol,

### Editor support

All the framework was designed to be easy and intuitive to use, all the decisions were tested on multiple editors even before starting development, to ensure the best development experience.

# `APIRouter` class

Here's the reference information for the `APIRouter` class, with all its parameters, attributes and methods.

You can import the `APIRouter` class directly from `fastapi`:

```python
from fastapi import APIRouter
```

::: fastapi.APIRouter
    options:
        members:
            - websocket
            - include_router
            - get
            - put
            - post
            - delete

# `FastAPI` class

Here's the reference information for the `FastAPI` class, with all its parameters, attributes and methods.

You can import the `FastAPI` class directly from `fastapi`:

```python
from fastapi import FastAPI
```

::: fastapi.FastAPI
    options:
        members:
            - openapi_version
            - webhooks
            - state
            - dependency_overrides
            - openapi

When there is an operation that will require waiting before giving the results and has support for these new Python features, you can code it like:

```Python
burgers = await get_burgers(2)
```

![ReDoc](https://fastapi.tiangolo.com/img/index/index-06-redoc-02.png)

### Özet

Özetlemek gerekirse, parametrelerin, gövdenin, vb. veri tiplerini fonksiyon parametreleri olarak **bir kere** tanımlıyoruz.

Bu işlemi standart modern Python tipleriyle yapıyoruz.

Yeni bir sözdizimi yapısını, bir kütüphane özel metod veya sınıfları öğrenmeye gerek yoktur.

Hepsi sadece **Python** standartlarına dayalıdır.