httplib2 post 問題

            h = httplib2.Http(".cache")
            body = {"proxy_id": t.imei, "uid": pk, "device": "O", "status": "",
                    "start": "", "end": "", "cellphone": ""}
            tb = urlencode(body)

            # 經多次測試必須帶上headers參數，否則POST的數據（body）內容傳不上去
            headers = {'Content-type': 'application/x-www-form-urlencoded'}

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