* example this converts `☃.net` to `xn--n3h.net`, and `WwW.GoOgLe.cOm` to `www.google.com`.
 * `null` will be returned if the host cannot be ToASCII encoded or if the result contains
 * unsupported ASCII characters.
 */
internal fun String.toCanonicalHost(): String? {
  val host: String = this

  // If the input contains a :, it’s an IPv6 address.
  if (":" in host) {

    }

    /**
     * Encodes the specified value using the character encoding.
     *
     * @param value the value to encode
     * @return the encoded value
     * @throws CurlException if the encoding is unsupported
     */
    protected String encode(final String value) {
        try {
            return URLEncoder.encode(value, encoding);
        } catch (final UnsupportedEncodingException e) {

    /** The key of the message: The specified sort {0} is unsupported. */
    public static final String ERRORS_invalid_query_unsupported_sort_field = "{errors.invalid_query_unsupported_sort_field}";

    /** The key of the message: The specified sort order {0} is unsupported. */

    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. This method exists only to hide {@link ImmutableSet#builderWithExpectedSize}
   * from consumers of {@code ImmutableSortedSet}.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Not supported by ImmutableSortedSet.
   */
  @DoNotCall("Use naturalOrder (which does not accept an expected size)")

  }

  /**
   * We don't have API support for rfc822Name values (email addresses) in the subject alternative
   * name, but we don't crash either.
   */
  @Test
  fun `unsupported general name tag`() {
    val certificateByteString =
      (
        "MIIFEDCCA/igAwIBAgIRAJK4dE9xztDibHKj2NXZJbIwDQYJKoZIhvcNAQELBQA" +

        // The actual behavior removes {lang} for unsupported languages
        assertEquals("https://example.com/98.76/test.html", helpUrl);

        getMockRequest().setLocale(Locale.JAPANESE);
        helpUrl = systemHelper.getHelpUrl("https://example.com/{lang}/{version}/test.html");
        // Check if Japanese is actually supported or just use the fallback
        assertTrue(helpUrl.contains("98.76"));

 *
 * <p>The views returned by {@link #column}, {@link #columnKeySet()}, and {@link #columnMap()} have
 * iterators that don't support {@code remove()}. Otherwise, all optional operations are supported.
 * Null row keys, columns keys, and values are not supported.
 *
 * <p>Lookups by row key are often faster than lookups by column key, because the data is stored in

                pageSize, offset);
    }

    /**
     * Converts an object value to a float for score calculations.
     * Handles Float and String types, returning 0.0f for unsupported types.
     *
     * @param value the object to convert to float
     * @return float representation of the value, or 0.0f if conversion fails
     */
    protected float toFloat(final Object value) {

          response.pushPromises.isEmpty() &&
          socketHandler == null
      )
      val flushHeaders = body == null || bodyDelayNanos != 0L
      require(!outFinished || trailers.size == 0) {
        "unsupported: no body and non-empty trailers $trailers"
      }

      socket.sleepWhileOpen(response.headersDelayNanos)
      stream.writeHeaders(response.toHttp2Headers(), outFinished, flushHeaders)

   *
   * <p>Since functions are not reversible, the transform is one-way and new items cannot be stored
   * in the returned list. The {@code add}, {@code addAll} and {@code set} methods are unsupported
   * in the returned list.
   *
   * <p>The function is applied lazily, invoked when needed. This is necessary for the returned list