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def application(environ, start_response): start_response('200 OK', [('Content-Type', 'text/html')]) return [b'<h1>Hello, web!</h1>']

 def finalize_request(self, rv, from_error_handler=False): response = self.make_response(rv) try: response = self.process_response(response) request_finished.send(self, response=response) except Exception: if not from_error_handler: raise self.logger.exception( "Request finalizing failed with an error while handling an error" ) return response

 def make_response(self, rv):
 # make sure the body is an instance of the response class # 看这里就好了， if not isinstance(rv, self.response_class): if isinstance(rv, (text_type, bytes, bytearray)): # let the response class set the status and headers instead of # waiting to do it manually, so that the class can handle any # special logic rv = self.response_class(rv, status=status, headers=headers) status = headers = None elif isinstance(rv, dict): rv = jsonify(rv) elif isinstance(rv, BaseResponse) or callable(rv): # evaluate a WSGI callable, or coerce a different response # class to the correct type try: rv = self.response_class.force_type(rv, request.environ) except TypeError as e: new_error = TypeError( "{e}\nThe view function did not return a valid" " response. The return type must be a string, dict, tuple," " Response instance, or WSGI callable, but it was a" " {rv.__class__.__name__}.".format(e=e, rv=rv) ) reraise(TypeError, new_error, sys.exc_info()[2]) else: raise TypeError( "The view function did not return a valid" " response. The return type must be a string, dict, tuple," " Response instance, or WSGI callable, but it was a" " {rv.__class__.__name__}.".format(rv=rv) )
 # prefer the status if it was provided if status is not None: if isinstance(status, (text_type, bytes, bytearray)): rv.status = status else: rv.status_code = status
 # extend existing headers with provided headers if headers: rv.headers.extend(headers)
 return rv

class Response(ResponseBase, JSONMixin): default_mimetype = "text/html"
 def _get_data_for_json(self, cache): return self.get_data()
 @property def max_cookie_size(self): """Read-only view of the :data:`MAX_COOKIE_SIZE` config key.
 See :attr:`~werkzeug.wrappers.BaseResponse.max_cookie_size` in Werkzeug's docs. """ if current_app: return current_app.config["MAX_COOKIE_SIZE"]
 # return Werkzeug's default when not in an app context return super(Response, self).max_cookie_size

 def __call__(self, environ, start_response): """Process this response as WSGI application.
 :param environ: the WSGI environment. :param start_response: the response callable provided by the WSGI server. :return: an application iterator """ app_iter, status, headers = self.get_wsgi_response(environ) start_response(status, headers) return app_iter

def application(environ, start_response): start_response('200 OK', [('Content-Type', 'text/html')]) return [b'<h1>Hello, web!</h1>']

fro werkzeug.datastructures import Headers

rv = self.response_class(rv, status=status, headers=headers)

from flask import Flask, Response
class MyResponse(Response): pass
app = Flask(__name__)app.response_class = MyResponse