老师好，我这边重写了一下flask.Response提供的类方法，想在接口中可以直接返回我自定义的响应类，但是为啥不生效嘞？
代码如下：

from flask import Response as _Response
from flask import Flask

class Response(_Response):
    default_status = 200
    default_mimetype = 'application/json'

    def __init__(self, response, **kwargs):
        if 'mimetype' not in kwargs and 'contenttype' not in kwargs:
            if response.startswith('<?xml'):
                kwargs['mimetype'] = 'application/xml'

        return super(Response, self).__init__(response, **kwargs)

	# 重写的这个类方法没有生效
    @classmethod
    def force_type(cls, response, environ=None):
        if isinstance(response, McResponse):
            r = response.response
        return super(Response, cls).force_type(r, environ)
        
class Flask(_Flask):
    json_encoder = JSONEncoder
    response_class = Response
  
def create_app(config_name=None):
	app = Flask(__name__)
	....
	return app

我想在试图函数中直接返回McResponse对象时，会有问题：
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 McResponse. // Werkzeug Debugger

想问下老师，为什么没有生效呢？