code: public static String format(
              final Iterable<? extends NameValuePair> parameters,
              final Charset charset) {
          return format(parameters, QP_SEP_A, charset);
      }
docs: Returns a String that is suitable for use as an {@code application/x-www-form-urlencoded}
  list of parameters in an HTTP PUT or HTTP POST.
  
  @param parameters  The parameters to include.
  @param charset The encoding to use.
  @return An {@code application/x-www-form-urlencoded} string
  
  @since 4.2