code: def getAppInfo(self, appId):
          
          params = {
              "f" : "json",
              "appID" : appId
          }
          url = self._url + "/oauth/getAppInfo"
          return self._get(url=url, param_dict=params,
                           proxy_url=self._proxy_url,
                           proxy_port=self._proxy_port)
docs: Every application registered with Portal for ArcGIS has a unique
          client ID and a list of redirect URIs that are used for OAuth. This
          operation returns these OAuth-specific properties of an application.
          You can use this information to update the redirect URIs by using
          the Update App Info operation.
  
          Input:
             appId - unique id of the application to get the information
              about.