urllib2.py 文件源码

def open(self, fullurl, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
        # accept a URL or a Request object
        if isinstance(fullurl, basestring):
            req = Request(fullurl, data)
        else:
            req = fullurl
            if data is not None:
                req.add_data(data)

        req.timeout = timeout
        protocol = req.get_type()

        # pre-process request
        meth_name = protocol+"_request"
        for processor in self.process_request.get(protocol, []):
            meth = getattr(processor, meth_name)
            req = meth(req)

        response = self._open(req, data)

        # post-process response
        meth_name = protocol+"_response"
        for processor in self.process_response.get(protocol, []):
            meth = getattr(processor, meth_name)
            response = meth(req, response)

        return response