http.py 文件源码

def getRequestHostname(self):
        """Get the hostname that the user passed in to the request.

        This will either use the Host: header (if it is available) or the
        host we are listening on if the header is unavailable.
        """
        return (self.getHeader('host') or
                socket.gethostbyaddr(self.getHost()[1])[0]
                ).split(':')[0]