## Use the `Request` object directly

Let's imagine you want to get the client's IP address/host inside of your *path operation function*.

For that you need to access the request directly.

```Python hl_lines="1  7-8"
{!../../docs_src/using_request_directly/tutorial001.py!}
```

By declaring a *path operation function* parameter with the type being the `Request` **FastAPI** will know to pass the `Request` in that parameter.

/// tip

"Шлях" (path) також зазвичай називають "ендпоінтом" (endpoint) або "маршрутом" (route).

///

При створенні API, "шлях" є основним способом розділення "завдань" і "ресурсів".
#### Operation

"Операція" (operation) тут означає один з "методів" HTTP.

Один з:

* `POST`
* `GET`
* `PUT`
* `DELETE`

...та більш екзотичних:

* `OPTIONS`
* `HEAD`
* `PATCH`
* `TRACE`

  public void testRemove_nullKeyQueriesUnsupported() {
    try {
      assertFalse(getMap().remove(null, v3()));
    } catch (NullPointerException tolerated) {
      // since the operation would be a no-op, the exception is not required
    }
    expectUnchanged();
  }

  @MapFeature.Require(value = SUPPORTS_REMOVE, absent = ALLOWS_NULL_VALUE_QUERIES)

`response_model`は「デコレータ」メソッド（`get`、`post`など）のパラメータであることに注意してください。すべてのパラメータやボディのように、*path operation関数* のパラメータではありません。

///

Pydanticモデルの属性に対して宣言するのと同じ型を受け取るので、Pydanticモデルになることもできますが、例えば、`List[Item]`のようなPydanticモデルの`list`になることもできます。

FastAPIは`response_model`を使って以下のことをします:

* 出力データを型宣言に変換します。
* データを検証します。
* OpenAPIの *path operation* で、レスポンス用のJSON Schemaを追加します。
* 自動ドキュメントシステムで使用されます。

しかし、最も重要なのは:

import (
	"fmt"
	"os"
	"path"
)

// Wrapper functions to os.RemoveAll, which calls reliableRemoveAll
// this is to ensure that if there is a racy parent directory
// create in between we can simply retry the operation.
func removeAll(dirPath string) (err error) {
	if dirPath == "" {
		return errInvalidArgument
	}

	if err = checkPathLength(dirPath); err != nil {
		return err
	}

  public void testRemove_nullKeyQueriesUnsupported() {
    try {
      assertFalse(getMap().remove(null, v3()));
    } catch (NullPointerException tolerated) {
      // since the operation would be a no-op, the exception is not required
    }
    expectUnchanged();
  }

  @MapFeature.Require(value = SUPPORTS_REMOVE, absent = ALLOWS_NULL_VALUE_QUERIES)

  public void testRemove_nullKeyQueriesUnsupported() {
    try {
      assertFalse(getMap().remove(null, v3()));
    } catch (NullPointerException tolerated) {
      // since the operation would be a no-op, the exception is not required
    }
    expectUnchanged();
  }

  @MapFeature.Require(value = SUPPORTS_REMOVE, absent = ALLOWS_NULL_VALUE_QUERIES)

In this case, this `__call__` is what **FastAPI** will use to check for additional parameters and sub-dependencies, and this is what will be called to pass a value to the parameter in your *path operation function* later.

## Parameterize the instance

And now, we can use `__init__` to declare the parameters of the instance that we can use to "parameterize" the dependency:

indent 12 }} {{- with .Values.nodeSelector }} nodeSelector: {{ toYaml . | indent 8 }} {{- end }} {{- include "minio.imagePullSecrets" . | indent 6 }} {{- with .Values.affinity }} affinity: {{ toYaml . | indent 8 }} {{- end }} {{- with .Values.tolerations }} tolerations: {{ toYaml . | indent 8 }} {{- end }} volumes: - name: export {{- if .Values.persistence.enabled }} persistentVolumeClai: claimName: {{ .Values.persistence.existingClaim | default (include "minio.fullname" .) }} {{- else }} emptyDir: {}...

indent 12 }} {{- with .Values.nodeSelector }} nodeSelector: {{ toYaml . | indent 8 }} {{- end }} {{- include "minio.imagePullSecrets" . | indent 6 }} {{- with .Values.affinity }} affinity: {{ toYaml . | indent 8 }} {{- end }} {{- with .Values.tolerations }} tolerations: {{ toYaml . | indent 8 }} {{- end }} volumes: - name: export {{- if .Values.persistence.enabled }} persistentVolumeClai: claimName: {{ .Values.persistence.existingClaim | default (include "minio.fullname" .) }} {{- else }} emptyDir: {}...