.put("X_WEBKIT_CSP_REPORT_ONLY", "X-WebKit-CSP-Report-Only")
            .buildOrThrow();
    ImmutableSet<String> uppercaseAcronyms =
        ImmutableSet.of(
            "CH", "ID", "DNT", "DNS", "DPR", "ECT", "GPC", "HTTP2", "IP", "MD5", "P3P", "RTT", "TE",
            "UA", "UID", "URL", "WWW", "XSS");

    for (Field field : httpHeadersFields()) {
      assertEquals(

  /**
   * The HTTP <a
   * href="https://privacycg.github.io/gpc-spec/#the-sec-gpc-header-field-for-http-requests">{@code
   * Sec-GPC}</a> header field name.
   *
   * @since 33.2.0
   */
  public static final String SEC_GPC = "Sec-GPC";

  /**
   * The HTTP <a
   * href="https://wicg.github.io/turtledove/#handling-direct-from-seller-signals">{@code