public void ProcessRequest(HttpContext context)
        {
            string result;

            var session = context.Session;
            var userId  = int.Parse((session["s_user_id"] != null ? session["s_user_id"].ToString() : "0"));
            var uid     = session["s_uid"] != null ? session["s_uid"].ToString() : "";
            var token   = session["s_token"] != null ? session["s_token"].ToString() : "";

            if (string.IsNullOrEmpty(session["s_guid"].ToString()))
            {
                WebUtility.RefreshGuid();
            }
            var guid        = session["s_guid"] != null ? session["s_guid"].ToString() : "";
            var systemType  = MConfigUtility.Get("SystemType");
            var systemkey   = MConfigUtility.Get("SystemKey");
            var requestTime = DateTime.Now;

            _memberInfo = new MemberInfo
            {
                UserId     = userId,
                Uid        = uid,
                ToKen      = token,
                Guid       = guid,
                SystemType = systemType
            };

            var callback = context.Request["callback"];

            try
            {
                var apiName = context.Request["_api"] ?? "";
                var apiHost = ApiUrlDict.ContainsKey(apiName) ? ApiUrlDict[apiName] : "";
                var url     = context.Request["_url"] ?? "";
                if (string.IsNullOrEmpty(apiHost))
                {
                    result = WebUtility.ApiResult("api 不能为空!");
                }
                else
                {
                    var data = context.Request["_data"] ?? "";

                    var requestUrl = string.Format("{0}/{1}/{2}/{3}/{4}/{5}{6}",
                                                   apiHost,
                                                   MemberInfo.SystemType,
                                                   string.IsNullOrEmpty(MemberInfo.ToKen) ? "null" : MemberInfo.ToKen,
                                                   string.IsNullOrEmpty(MemberInfo.Guid) ? "null" : MemberInfo.Guid,
                                                   MemberInfo.UserId,
                                                   string.IsNullOrEmpty(MemberInfo.Uid) ? "null" : MemberInfo.Uid,
                                                   string.IsNullOrEmpty(url) ? "" : "/" + url.Trim('/'));

                    var uri = new Uri(requestUrl
                                      + "?time="
                                      + requestTime
                                      + "&md5="
                                      + System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(string.Format("{0}{1}{2}{3}", requestUrl, requestTime, data, systemkey).ToUpper(), "MD5"));

                    var method = (MMethodType)Enum.Parse(typeof(MMethodType), context.Request["_type"] ?? "GET");

                    var contentType = context.Request["_contentType"] ?? "";
                    var accept      = context.Request["_accept"] ?? "";
                    result = WebUtility.InvokeRestApi(new InvokeParmeter()
                    {
                        Uri         = uri,
                        Method      = method,
                        Data        = data,
                        Callback    = callback,
                        ContentType = contentType,
                        Accept      = accept
                    });
                    ApiFactory.FormatResult(ref result, apiName, _memberInfo, context);
                }
            }
            catch (Exception ex)
            {
                result = WebUtility.ApiResult(ex.ToString());
            }
            if (!string.IsNullOrEmpty(callback))
            {
                context.Response.Write(string.Format("{0}({1});", callback, result));
            }
            else
            {
                context.Response.Write(result);
            }
        }