{* ../../docs_src/header_params/tutorial002_an_py310.py hl[10] *}

/// warning | 警告

在將 `convert_underscores` 設為 `False` 之前，請注意有些 HTTP 代理與伺服器不允許使用帶有底線的標頭。

///

## 重複的標頭 { #duplicate-headers }

有時可能會收到重複的標頭，也就是同一個標頭會有多個值。

可以在型別宣告中使用 list 來定義這種情況。

你會以 Python 的 `list` 形式收到該重複標頭的所有值。

例如，要宣告可以出現多次的 `X-Token` 標頭，可以這樣寫：

{* ../../docs_src/header_params/tutorial003_an_py310.py hl[9] *}

    int NT_STATUS_PIPE_LISTENING = 0xC00000b3;
    /** The file that was specified is a directory */
    int NT_STATUS_FILE_IS_A_DIRECTORY = 0xC00000ba;
    /** A duplicate name exists on the network */
    int NT_STATUS_DUPLICATE_NAME = 0xC00000bd;
    /** The specified network name is no longer available */
    int NT_STATUS_NETWORK_NAME_DELETED = 0xC00000c9;

    testers.add(SetHashCodeTester.class);
    testers.add(SetEqualsTester.class);
    testers.add(SetRemoveTester.class);
    // SetRemoveAllTester doesn't exist because, Sets not permitting
    // duplicate elements, there are no tests for Set.removeAll() that aren't
    // covered by CollectionRemoveAllTester.
    return testers;
  }

  @Override
  protected List<TestSuite> createDerivedSuites(

    return C2 * Integer.rotateLeft(hashCode * C1, 15);
  }

  private boolean checkFilter(int c) {
    return ((filter >> c) & 1) == 1;
  }

  // This is all essentially copied from ImmutableSet, but we have to duplicate because
  // of dependencies.

  // Represents how tightly we can pack things, as a maximum.
  private static final double DESIRED_LOAD_FACTOR = 0.5;

  /**

    // my best guess is that the jdk authors have spent more time optimizing that callpath than this
    // one. (StringCoding$StringDecoder vs. StreamDecoder).  StringCoding has a ton of special cases
    // theoretically we could duplicate all that logic here to try to beat 'new String' or at least
    // come close.
    USING_DECODER_WITH_SIZE_HINT {
      @Override
      String read(ByteSource byteSource, Charset cs) throws IOException {

    // my best guess is that the jdk authors have spent more time optimizing that callpath than this
    // one. (StringCoding$StringDecoder vs. StreamDecoder).  StringCoding has a ton of special cases
    // theoretically we could duplicate all that logic here to try to beat 'new String' or at least
    // come close.
    USING_DECODER_WITH_SIZE_HINT {
      @Override
      String read(ByteSource byteSource, Charset cs) throws IOException {

{* ../../docs_src/header_params/tutorial002_an_py310.py hl[10] *}

/// warning | 경고

`convert_underscores`를 `False`로 설정하기 전에, 어떤 HTTP 프록시들과 서버들은 언더스코어가 포함된 헤더 사용을 허락하지 않는다는 것을 명심하십시오.

///

## 중복 헤더 { #duplicate-headers }

중복 헤더들을 수신할 수 있습니다. 즉, 다중값을 갖는 동일한 헤더를 뜻합니다.

타입 정의에서 리스트를 사용하여 이러한 케이스를 정의할 수 있습니다.

중복 헤더의 모든 값을 파이썬 `list`로 수신합니다.

예를 들어, 두 번 이상 나타날 수 있는 `X-Token`헤더를 선언하려면, 다음과 같이 작성합니다:

                                <c:if test="${editable}"><la:link styleClass="btn btn-info"
                                                                  href="/admin/dataconfig/duplicate/${f:u(id)}">
                                    <i class="fa fa-copy" aria-hidden="true"></i>
                                    <la:message key="labels.crud_button_duplicate"/>
                                </la:link></c:if>

                                <c:if test="${editable}"><la:link styleClass="btn btn-info"
                                                                  href="/admin/webconfig/duplicate/${f:u(id)}">
                                    <i class="fa fa-copy" aria-hidden="true"></i>
                                    <la:message key="labels.crud_button_duplicate"/>
                                </la:link></c:if>

                                <c:if test="${editable}"><la:link styleClass="btn btn-info"
                                                                  href="/admin/fileconfig/duplicate/${f:u(id)}">
                                    <i class="fa fa-copy" aria-hidden="true"></i>
                                    <la:message key="labels.crud_button_duplicate"/>
                                </la:link></c:if>