即使它们都在 `localhost` 中，但是它们使用不同的协议或者端口，所以它们都是不同的「源」。

## 步骤

假设你的浏览器中有一个前端运行在 `http://localhost:8080`，并且它的 JavaScript 正在尝试与运行在 `http://localhost` 的后端通信（因为我们没有指定端口，浏览器会采用默认的端口 `80`）。

然后，浏览器会向后端发送一个 HTTP `OPTIONS` 请求，如果后端发送适当的 headers 来授权来自这个不同源（`http://localhost:8080`）的通信，浏览器将允许前端的 JavaScript 向后端发送请求。

为此，后端必须有一个「允许的源」列表。

在这种情况下，它必须包含 `http://localhost:8080`，前端才能正常工作。

## 通配符

也可以使用 `"*"`（一个「通配符」）声明这个列表，表示全部都是允许的。

        addErrorProneDependency("com.uber.nullaway:nullaway:0.12.10")

        project.tasks.named<JavaCompile>(this.compileJavaTaskName) {
            options.errorprone {
                isEnabled = extension.enabled
                checks = errorproneExtension.disabledChecks.map {
                    it.associateWith { CheckSeverity.OFF }
                }

 * to parse the HTML content, evaluate XPath expressions, and generate the XML output.
 * </p>
 * <p>
 * The class supports various XPath result types, including BOOLEAN, NUMBER, STRING, NODESET, and NODE.
 * It also provides options to trim whitespace from extracted values and to specify the character encoding for the output.
 * </p>
 * <p>
 * The {@link #getData(AccessResultData)} method allows retrieving the transformed data as a String (XML content),

            LOGGER.info(
                    "System property '" + Constants.MAVEN_LOGGER_DEFAULT_LOG_LEVEL + "' is already set to '" + current
                            + "' - ignoring system property and get log level from -X/-e/-q options, log level will be set to "
                            + value);
        }
    }

    @Override
    public void activate() {
        ILoggerFactory lf = LoggerFactory.getILoggerFactory();

     * aka CREATE_ALWAYS (according to the wire when calling CreateFile)
     */

    static final int FILE_OVERWRITE_IF = 0x5;

    // create options
    static final int FILE_WRITE_THROUGH = 0x00000002;
    static final int FILE_SEQUENTIAL_ONLY = 0x00000004;
    static final int FILE_SYNCHRONOUS_IO_ALERT = 0x00000010;

curl -sS -L -O https://www.iana.org/time-zones/repository/releases/tzdata$DATA.tar.gz
tar xzf tzcode$CODE.tar.gz
tar xzf tzdata$DATA.tar.gz

# The PACKRATLIST and PACKRATDATA options are copied from Ubuntu:
# https://git.launchpad.net/ubuntu/+source/tzdata/tree/debian/rules?h=debian/sid
#
# You can see the description of these make variables in the tzdata Makefile:

   * X-Download-Options}</a> header field name.
   *
   * <p>When the new X-Download-Options header is present with the value {@code noopen}, the user is
   * prevented from opening a file download directly; instead, they must first save the file
   * locally.
   *
   * @since 24.1
   */
  public static final String X_DOWNLOAD_OPTIONS = "X-Download-Options";

  workflow_dispatch:
    inputs:
      debug_enabled:
        description: Run with tmate debugging enabled (https://github.com/marketplace/actions/debugging-with-tmate)
        required: false
        default: "false"
      command:
        description: Command to run
        type: choice
        options:
          - translate-page
          - translate-lang
          - update-outdated
          - add-missing
          - update-and-add

    name: Test IAM import in new cluster with missing entities
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-go@v5
        with:
          go-version: ${{ matrix.go-version }}
          check-latest: true
      - name: Checkout minio-iam-testing
        uses: actions/checkout@v4
        with:
          repository: minio/minio-iam-testing
          path: minio-iam-testing

        # Supported options are ['csharp', 'cpp', 'go', 'java', 'javascript', 'python']
        language: ['java']
        # Learn more...
        # https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#overriding-automatic-language-detection

    steps:
    - name: Checkout repository
      uses: actions/checkout@v4