code: public static DefaultGoApiResponse badRequest(String responseBody) {
          DefaultGoApiResponse defaultGoApiResponse = new DefaultGoApiResponse(400);
          defaultGoApiResponse.setResponseBody(responseBody);
          return defaultGoApiResponse;
      }
docs: Creates an instance DefaultGoApiResponse which represents bad request with response code 400
  
  @param responseBody Response body
  @return an instance of DefaultGoApiResponse