fetchers.py 文件源码

def fetch(self, url, body=None, headers=None):
        """
        This performs an HTTP POST or GET, following redirects along
        the way. If a body is specified, then the request will be a
        POST. Otherwise, it will be a GET.


        @param headers: HTTP headers to include with the request
        @type headers: {str:str}

        @return: An object representing the server's HTTP response. If
            there are network or protocol errors, an exception will be
            raised. HTTP error responses, like 404 or 500, do not
            cause exceptions.

        @rtype: L{HTTPResponse}

        @raise Exception: Different implementations will raise
            different errors based on the underlying HTTP library.
        """
        raise NotImplementedError