public static final String ORIGIN = "Origin";
  /**
   * The HTTP <a href="https://github.com/WICG/origin-isolation">{@code Origin-Isolation}</a> header
   * field name.
   *
   * @since 30.1
   */
  public static final String ORIGIN_ISOLATION = "Origin-Isolation";
  /** The HTTP {@code Proxy-Authorization} header field name. */
  public static final String PROXY_AUTHORIZATION = "Proxy-Authorization";