code: protected String bodyToString() {
          if (this.bodyString == null && !isSuccess(this.responseCode)) {
              this.bodyString = readErrorStream(this.getErrorStream());
          }
  
          return this.bodyString;
      }
docs: Returns a string representation of this response's body. This method is used when logging this response's body.
  By default, it returns an empty string (to avoid accidentally logging binary data) unless the response contained
  an error message.
  @return a string representation of this response's body.