query_extractor --> query_or_cookie_extractor --> read_query
```

## Using the same dependency multiple times { #using-the-same-dependency-multiple-times }

If one of your dependencies is declared multiple times for the same *path operation*, for example, multiple dependencies have a common sub-dependency, **FastAPI** will know to call that sub-dependency only once per request.

#!groovy

pipeline {
  agent none
  // save some io during the build
  options {
    skipDefaultCheckout()
    durabilityHint('PERFORMANCE_OPTIMIZED')
    disableRestartFromStage()
  }
  stages {
    stage("Build / Test - JDK17") {
      agent { node { label 'ubuntu' } }
      steps {
        timeout(time: 210, unit: 'MINUTES') {
          checkout scm
          mavenBuild("jdk_17_latest", "")
          script {

		}
	}
}

// Save various references we are going to need later.
func (f *File) saveExprs(x any, context astContext) {
	switch x := x.(type) {
	case *ast.Expr:
		switch (*x).(type) {
		case *ast.SelectorExpr:
			f.saveRef(x, context)
		}
	case *ast.CallExpr:
		f.saveCall(x, context)
	}
}

// Save references to C.xxx for later processing.

        }
    ]
}
```

## 밑줄 변환 비활성화하기 { #disable-convert-underscores }

일반적인 헤더 매개변수와 마찬가지로, 매개변수 이름에 밑줄 문자가 있으면 **자동으로 하이픈으로 변환**됩니다.

예를 들어, 코드에 `save_data` 헤더 매개변수가 있으면, 기대되는 HTTP 헤더는 `save-data`이고, 문서에서도 그렇게 표시됩니다.

어떤 이유로든 이 자동 변환을 비활성화해야 한다면, 헤더 매개변수용 Pydantic 모델에서도 비활성화할 수 있습니다.

{* ../../docs_src/header_param_models/tutorial003_an_py310.py hl[19] *}

/// warning | 경고

.settings/**

# Files generated by JetBrains IDEs, e.g. IntelliJ IDEA
.idea/
*.iml

# Vscode files
.vscode

# This is where the result of the go build goes
/output*/
/_output*/
/_output

# Emacs save files
*~
\#*\#
.\#*

# Vim-related files
[._]*.s[a-w][a-z]
[._]s[a-w][a-z]
*.un~
Session.vim
.netrwhist

# cscope-related files
cscope.*

# Go test binaries
*.test

            "input": "plumbus",
        }
    ]
}
```

## 禁用下划线转换 { #disable-convert-underscores }

与常规的 header 参数相同，当参数名中包含下划线时，会**自动转换为连字符**。

例如，如果你的代码中有一个名为 `save_data` 的 header 参数，那么预期的 HTTP 头将是 `save-data`，并且在文档中也会以这种形式显示。

如果由于某些原因你需要禁用这种自动转换，你也可以在用于 header 参数的 Pydantic 模型中进行设置。

{* ../../docs_src/header_param_models/tutorial003_an_py310.py hl[19] *}

/// warning | 警告

     *
     * @throws IOException if `protocol` is unknown.
     */
    @JvmStatic
    @Throws(IOException::class)
    fun get(protocol: String): Protocol {
      // Unroll the loop over values() to save an allocation.
      @Suppress("DEPRECATION")
      return when (protocol) {
        HTTP_1_0.protocol -> {
          HTTP_1_0
        }

        HTTP_1_1.protocol -> {
          HTTP_1_1
        }

                                        }
                                    }
                                },
                            },
                        },
                        "summary": "Save Item No Body",
                        "operationId": "save_item_no_body_items__post",
                        "requestBody": {
                            "content": {
                                "application/json": {

            "input": "plumbus",
        }
    ]
}
```

## 停用底線轉換 { #disable-convert-underscores }

與一般標頭參數相同，當參數名稱包含底線字元時，會自動轉換為連字號。

例如，若在程式碼中有標頭參數 `save_data`，實際期望的 HTTP 標頭為 `save-data`，在文件中也會如此顯示。

如果因某些原因需要停用這個自動轉換，你也可以在標頭參數的 Pydantic 模型上設定。

{* ../../docs_src/header_param_models/tutorial003_an_py310.py hl[19] *}

/// warning | 警告

A container normally has a **single process**, but it's also possible to start subprocesses from the main process, and that way you will have **multiple processes** in the same container.

But it's not possible to have a running container without **at least one running process**. If the main process stops, the container stops.

## Build a Docker Image for FastAPI { #build-a-docker-image-for-fastapi }