void BeginRequestOccur(object sender, EventArgs e)
        {
            HttpApplication app     = (HttpApplication)sender;
            HttpContext     context = app.Context;

            //处理DEBUG模式
            if (base.IsDebugRequest(context))
            {
                return;
            }

            //如果启用URL过滤器
            if (useFilter)
            {
                if (urlFilter != null)
                {
                    //如果不是需要处理的URL
                    if (!urlFilter.IsAllowed(context.Request.RawUrl))
                    {
                        context.Items.Add(SKIP_REQUEST, true);
                        return;
                    }
                }
            }

            //在Request的开始, 启动一个计时器
            Stopwatch watch = new Stopwatch();

            watch.Start();
            context.Items.Add("Watch", watch);
            StreamWatcher watcher = new StreamWatcher(context.Response.Filter);

            context.Response.Filter = watcher;
        }
        void EndRequestOccur(object sender, EventArgs e)
        {
            HttpApplication app     = (HttpApplication)sender;
            HttpContext     context = app.Context;

            //如果是需要跳过或处于DEBUG页面时,直接结束掉
            if (context.Items.Contains(SKIP_REQUEST))
            {
                //如果存在, 且值为True, 那么直接返回
                if ((bool)context.Items[SKIP_REQUEST])
                {
                    return;
                }
            }

            if (context.Items.Contains(DEBUG))
            {
                return;
            }

            long duration = 0L;

            //获取执行时间
            if (context.Items.Contains("Watch"))
            {
                Stopwatch watch = (Stopwatch)context.Items["Watch"];
                if (watch.IsRunning)
                {
                    watch.Stop();
                    duration = watch.ElapsedMilliseconds;
                }
            }
            //获取请求地址
            string callUrl      = base.GetPureUrl(context.Request.RawUrl);
            long   requestSize  = context.Request.CountRequestSize();
            long   responseSize = 0;

            //当IIS版本为IIS7和IIS8时
            if (iisVersion == WebServerType.IIS7 || iisVersion == WebServerType.IIS8)
            {
                responseSize = context.Response.GetCombineHeaders(true).Length;
            }

            StreamWatcher watcher = (StreamWatcher)context.Response.Filter;

            if (context.Response.Filter is StreamWatcher)
            {
                responseSize += watcher.Length;
            }

            string accesstoken = "", callAccesstoken = "";
            int    callAppId = 0;

            GetAccessTokenAndCallAccessToken(out accesstoken, out callAccesstoken, out callAppId);
            //推送数据
            GathererContext.Current.AppendApiCall(
                accesstoken, callAccesstoken, callAppId,
                callUrl, context.Response.StatusCode,
                responseTime: duration, requestSize: requestSize, responseSize: responseSize);
        }
        void BeginRequestOccur(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            //处理DEBUG模式
            if (base.IsDebugRequest(context))
                return;

            //如果启用URL过滤器
            if (useFilter)
            {
                if (urlFilter != null)
                {
                    //如果不是需要处理的URL
                    if (!urlFilter.IsAllowed(context.Request.RawUrl))
                    {
                        context.Items.Add(SKIP_REQUEST, true);
                        return;
                    }
                }
            }

            //在Request的开始, 启动一个计时器
            Stopwatch watch = new Stopwatch();
            watch.Start();
            context.Items.Add("Watch", watch);
            StreamWatcher watcher = new StreamWatcher(context.Response.Filter);
            context.Response.Filter = watcher;
        }