code: public HttpRequest buildPatchRequest(GenericUrl url, HttpContent content) throws IOException {
      return buildRequest(HttpMethods.PATCH, url, content);
    }
docs: Builds a {@code PATCH} request for the given URL and content.
  
  @param url HTTP request URL or {@code null} for none
  @param content HTTP request content or {@code null} for none
  @return new HTTP request