message: fix the bug for api server
diff: @@ -162,7 +162,7 @@ string getArgValue(int argc, char* argv[], string argname, string default_value)
  }
  }
  - printf("the param is not exist,using the default value:" + default_value);
  + cout<<"the param is not exist,using the default value:"<<default_value<<endl;
  return default_value;
  }
  