ImmutableSet.of("foo.bar.google.com", "a.b.co.uk", "x.y.ca.us", "a.b.blogspot.com");

  private static final ImmutableSet<String> VALID_IP_ADDRS =
      ImmutableSet.of("1.2.3.4", "127.0.0.1", "::1", "2001:db8::1");

  private static final ImmutableSet<String> INVALID_IP_ADDRS =
      ImmutableSet.of(
          "", "1", "1.2.3", "...", "1.2.3.4.5", "400.500.600.700", ":", ":::1", "2001:db8:");

      ImmutableSet.of("foo.bar.google.com", "a.b.co.uk", "x.y.ca.us", "a.b.blogspot.com");

  private static final ImmutableSet<String> VALID_IP_ADDRS =
      ImmutableSet.of("1.2.3.4", "127.0.0.1", "::1", "2001:db8::1");

  private static final ImmutableSet<String> INVALID_IP_ADDRS =
      ImmutableSet.of(
          "", "1", "1.2.3", "...", "1.2.3.4.5", "400.500.600.700", ":", ":::1", "2001:db8:");

            .buildOrThrow();
    ImmutableSet<String> uppercaseAcronyms =
        ImmutableSet.of(
            "CH", "ID", "DNT", "DNS", "DPR", "ECT", "GPC", "HTTP2", "IP", "MD5", "P3P", "RTT", "TE",
            "UA", "UID", "URL", "WWW", "XSS");
    assertConstantNameMatchesString(HttpHeaders.class, specialCases, uppercaseAcronyms);
  }

  // Visible for other tests to use

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   * href="https://iabtechlab.com/wp-content/uploads/2019/06/VAST_4.2_final_june26.pdf">{@code
   * X-Device-IP}</a> header field name. Header used for VAST requests to provide the IP address of
   * the device on whose behalf the request is being made.
   *
   * @since 31.0
   */
  public static final String X_DEVICE_IP = "X-Device-IP";
  /**
   * The HTTP <a