__init__.py 文件源码

def respond(self):
        """Process the current request."""

        """
        From PEP 333:

            The start_response callable must not actually transmit
            the response headers. Instead, it must store them for the
            server or gateway to transmit only after the first
            iteration of the application return value that yields
            a NON-EMPTY string, or upon the application's first
            invocation of the write() callable.
        """

        response = self.req.server.wsgi_app(self.env, self.start_response)
        try:
            for chunk in filter(None, response):
                if not isinstance(chunk, six.binary_type):
                    raise ValueError('WSGI Applications must yield bytes')
                self.write(chunk)
        finally:
            if hasattr(response, 'close'):
                response.close()