text: # -*- coding: utf-8 -*-
  
  from flowai.rest.app_base     import AppBase
  from flowai.rest.predictor    import Predictor
  from flowai.rest.response     import Response
  
  
  class FlowApp(AppBase):
  
      def __init__(self, api_key: str = None):
          # assertions
          # ...
          # initializations
          self.__predictor = Predictor(api_key=api_key)
          self.api_key = api_key
  
      def predict_by_url(self, input_url: str, model_name: str = None):
          prediction = self.__predictor.predict(input_url, model_name)
          return prediction
  
      def __str__(self):
          return f"""
      Instance:
          FlowApp(api_key="{self.api_key}")
      
      Methods:
          predict_by_url(input_url: str, model_name: str)"""