public static final String CROSS_ORIGIN_EMBEDDER_POLICY_REPORT_ONLY =
      "Cross-Origin-Embedder-Policy-Report-Only";
  /**
   * The HTTP Cross-Origin-Opener-Policy header field name.
   *
   * @since 28.2
   */
  public static final String CROSS_ORIGIN_OPENER_POLICY = "Cross-Origin-Opener-Policy";
  /** The HTTP {@code ETag} header field name. */
  public static final String ETAG = "ETag";