httplib2 post 问题

            h = httplib2.Http(".cache")            body = {"proxy_id": t.imei, "uid": pk, "device": "O", "status": "",                    "start": "", "end": "", "cellphone": ""}            tb = urlencode(body)            # 经多次测试必须带上headers参数，否则POST的数据（body）内容传不上去            headers = {'Content-type': 'application/x-www-form-urlencoded'}

            response, result = h.request("http://xxx.com/service", method="POST", body=tb, headers=headers)