* Import `Jinja2Templates`.
* Create a `templates` object that you can re-use later.
* Declare a `Request` parameter in the *path operation* that will return a template.
* Use the `templates` you created to render and return a `TemplateResponse`, pass the name of the template, the request object, and a "context" dictionary with key-value pairs to be used inside of the Jinja2 template.

```Python hl_lines="4  11  15-18"

{{ $mcsAPIGroup := or .Values.pilot.env.MCS_API_GROUP "multicluster.x-k8s.io" }}
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: istio-reader-clusterrole{{- if not (eq .Values.revision "")}}-{{ .Values.revision }}{{- end }}-{{ .Release.Namespace }}
  labels:
    app: istio-reader
    release: {{ .Release.Name }}
rules:
  - apiGroups:
      - "config.istio.io"
      - "security.istio.io"
      - "networking.istio.io"

^ \*\s*$
^ \* Licensed under the Apache License, Version 2\.0 \(the "License"\);\s*$
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: istio-reader-clusterrole{{- if not (eq .Values.revision "")}}-{{ .Values.revision }}{{- end }}-{{ .Release.Namespace }}
  labels:
    app: istio-reader
    release: {{ .Release.Name }}
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: istio-reader-clusterrole{{- if not (eq .Values.revision "")}}-{{ .Values.revision }}{{- end }}-{{ .Release.Namespace }}

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: istio-reader-clusterrole{{- if not (eq .Values.revision "")}}-{{ .Values.revision }}{{- end }}-{{ .Release.Namespace }}
  labels:
    app: istio-reader
    release: {{ .Release.Name }}
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: istio-reader-clusterrole{{- if not (eq .Values.revision "")}}-{{ .Values.revision }}{{- end }}-{{ .Release.Namespace }}

	}
}

// Tests hash reader checksum verification.
func TestHashReaderVerification(t *testing.T) {
	testCases := []struct {
		desc              string
		src               io.Reader
		size              int64
		actualSize        int64
		md5hex, sha256hex string
		err               error
	}{
		0: {

// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful

	}
}

var UnreadRuneErrorTests = []struct {
	name string
	f    func(*Reader)
}{
	{"Read", func(r *Reader) { r.Read([]byte{0}) }},
	{"ReadByte", func(r *Reader) { r.ReadByte() }},
	{"UnreadRune", func(r *Reader) { r.UnreadRune() }},
	{"Seek", func(r *Reader) { r.Seek(0, io.SeekCurrent) }},
	{"WriteTo", func(r *Reader) { r.WriteTo(&Buffer{}) }},
}

func TestUnreadRuneError(t *testing.T) {

## `Header` 임포트

먼저 `Header`를 임포트합니다:

```Python hl_lines="3"
{!../../../docs_src/header_params/tutorial001.py!}
```

## `Header` 매개변수 선언

`Path`, `Query` 그리고 `Cookie`를 사용한 동일한 구조를 이용하여 헤더 매개변수를 선언합니다.

첫 번째 값은 기본값이며, 추가 검증이나 어노테이션 매개변수 모두 전달할 수 있습니다:

```Python hl_lines="9"
{!../../../docs_src/header_params/tutorial001.py!}
```

!!! note "기술 세부사항"

# Header-параметры

Вы можете определить параметры заголовка таким же образом, как вы определяете параметры `Query`, `Path` и `Cookie`.

## Импорт `Header`

Сперва импортируйте `Header`:

=== "Python 3.10+"

    ```Python hl_lines="3"
    {!> ../../../docs_src/header_params/tutorial001_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="3"
    {!> ../../../docs_src/header_params/tutorial001_an_py39.py!}
    ```