request.py 文件源码

def file_open(self, req):
        url = req.selector
        if url[:2] == '//' and url[2:3] != '/' and (req.host and
                req.host != 'localhost'):
            if not req.host is self.get_names():
                raise URLError("file:// scheme is supported only on localhost")
        else:
            return self.open_local_file(req)

    # names for the localhost