* header field name.
   *
   * @since 27.1
   */
  public static final String ORIGIN_TRIAL = "Origin-Trial";
  /** The HTTP {@code P3P} header field name. Limited browser support. */
  public static final String P3P = "P3P";
  /** The HTTP {@code Proxy-Authenticate} header field name. */
  public static final String PROXY_AUTHENTICATE = "Proxy-Authenticate";