* #withParameters(String, Iterable)}. Prefer {@link #withCharset} for setting the {@code charset}
   * parameter when using a {@link Charset} object.
   *
   * @throws IllegalArgumentException if either {@code attribute} or {@code value} is invalid
   */
  public MediaType withParameter(String attribute, String value) {
    return withParameters(attribute, ImmutableSet.of(value));
  }

  /**

   * #withParameters(String, Iterable)}. Prefer {@link #withCharset} for setting the {@code charset}
   * parameter when using a {@link Charset} object.
   *
   * @throws IllegalArgumentException if either {@code attribute} or {@code value} is invalid
   */
  public MediaType withParameter(String attribute, String value) {
    return withParameters(attribute, ImmutableSet.of(value));
  }

  /**