docs: @Override
      public String getMessage() {
          return new StringBuilder()
                  .append("Request [").append(requestMethod.toString()).append("] ")
                  .append("to URL: ").append(requestUri).append(" has failed with ")
                  .append("Status code: ")
                  .append(statusCode).append('\n')
                  .append("Status message: ")
                  .append(statusMessage).append('\n')
                  .append("Content: '").append(content).append('\'')
                  .toString();
      }