private HttpWebRequest buildRequest(Dictionary <object, object> context, RequestInputModel Params)
        {
            Config Config = (Config)context[Constant.CONFIG_CONTEXT_KEY];
            string zone   = (string)context[Constant.PARAM_KEY_REQUEST_ZONE];

            Dictionary <object, object> paramsQuery   = ParamInvokeUtil.getRequestParams(Params, Constant.PARAM_TYPE_QUERY);
            Dictionary <object, object> paramsBody    = ParamInvokeUtil.getRequestParams(Params, Constant.PARAM_TYPE_BODY);
            Dictionary <object, object> paramsHeaders = ParamInvokeUtil.getRequestParams(Params, Constant.PARAM_TYPE_HEADER);

            paramsHeaders.Add("action", context["action"]);
            if (paramsHeaders.ContainsKey("zone"))
            {
                paramsHeaders["zone"] = zone;
            }
            else
            {
                paramsHeaders.Add("zone", zone);
            }

            if (context.ContainsKey(Constant.PARAM_KEY_USER_AGENT))
            {
                paramsHeaders.Add(Constant.PARAM_KEY_USER_AGENT, context[Constant.PARAM_KEY_USER_AGENT]);
            }

            String requestApi = (String)context[Constant.PARAM_KEY_REQUEST_APINAME];
            //string FileBody = GetBodyFile(context[Constant.PARAM_KEY_OBJECT_NAME].ToString()).ToString();

            string method      = (string)context[Constant.PARAM_KEY_REQUEST_METHOD];
            string requestPath = Config.getHost() + Config.getUri();
            string singedUrl   =
                SignatureUtil.getURL(
                    Config.getAccessKey(),
                    Config.getAccessSecret(),
                    method,
                    requestPath,
                    paramsQuery,
                    paramsHeaders);

            singedUrl = Config.getProtocol() + "://" + singedUrl;

            logger.Info(singedUrl);

            //System.Console.WriteLine(singedUrl);
            HttpWebRequest request =
                HttpRequestClient.getInstance()
                .buildCloudRequest(method, paramsBody, singedUrl, paramsHeaders);

            return(request);
        }