Wsgiref错误：AttributeError：'NoneType'对象没有属性'split'

Wsgiref错误：AttributeError：'NoneType'对象没有属性'split'

怎么样，您需要的

yield

是输出而不是返回它。

from wsgiref.simple_server import make_serverclass DemoApp:    def __init__(self, environ, start_response):        self.environ = environ        self.start = start_response    def __iter__(self):        status = '200 OK'        response_headers = [('Content-type', 'text/plain')]        self.start(status, response_headers)        yield 'Hello world!'if __name__ == '__main__':    httpd = make_server('', 1000, DemoApp)    print("Serving HTTP on port 1000...")    httpd.serve_forever()