flask-response

flask-response

---

• About Response:
  • View of the function return value will be automatically converted into a response object, flask conversion logic is as follows:
    • If it returns a string, then the flask is re-created object of werkzeug.wrappers.Response, the string as a host Response status code 200, MIME is text / html, and then return Response
    • If a return is ancestral, the data type of the ancestral should be (response, status, headers). Status overrides the default value of the status code 200, header may be a list or dictionary, as a response to the first message.
    • If it returns a Response object is returned directly.
    • If the above conditions are not met, flask will try to call Response.force_type be converted to such a request

  •  1 from flask import Flask, Response, jsonify
     2 
     3 app = Flask(__name__)
     4 
     5 
     6 class JsonResponse(Response):
     7     @classmethod
     8     def force_type(cls, response, environ=None):
     9         if isinstance(response, dict):
    10             response = jsonify(response)
    11         return super(JsonResponse, cls).force_type(response, environ)
    12 
    13 
    14 app.response_class = JsonResponse
    15 
    16 
    17 @app.route('/')
    18 def index():
    19     response = Response(response='HELLO', status=200, content_type='text/html;charset=utf-8')
    20     return response
    21 
    22 
    23 @app.route('/json')
    24 def json_test():
    25     return {'hello': 'world'}
    26 
    27 
    28 if __name__ == '__main__':
    29     app.run()

     

  • flask custom return object classes

    • Create a custom object class needs to inherit Response class
    • When you need to return the original to meet the flask does not support the return of a certain type of data, you need to override a class method force_type
    • The response is then processed so that the object of the parent class to handle Response
    • The app class to return to return a custom class