public static String format(
            final Iterable<? extends NameValuePair> parameters,
            final Charset charset) {
        return format(parameters, QP_SEP_A, charset);
    }
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
aws-java-sdk-core/src/main/java/com/amazonaws/util/URLEncodedUtils.java