code: public String getStringBody() throws BoxException {
          if (mBodyString != null) {
              return mBodyString;
          }
  
          InputStream stream = null;
          try {
              stream = isErrorCode(this.mResponseCode) ?
                      mConnection.getErrorStream() :
                      mConnection.getInputStream();
              mBodyString = readStream(stream);
          } catch (IOException e) {
              throw new BoxException("Unable to get string body", e);
          }
          return mBodyString;
      }
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.
  @throws BoxException thrown if there was an issue getting the body.