docs: public static Request create(String method,
                                 String url,
                                 Map<String, Collection<String>> headers,
                                 byte[] body,
                                 Charset charset) {
      checkNotNull(method, "httpMethod of %s", method);
      HttpMethod httpMethod = HttpMethod.valueOf(method.toUpperCase());
      return create(httpMethod, url, headers, body, charset);
    }