Fiddler参数解读

在对系统监控的过程中，发现ClientConnected和ClientBeginRequest之间有超过10秒的间隔时间的情况发生。

例如：

ClientConnected:  09:50:31.066
ClientBeginRequest: 09:50:41.113

查了http://fiddler.wikidot.com/timers，看到了对这种现象的说明

• ClientConnected- Exact time that the client browser made a TCP/IP connection to Fiddler.
• ClientBeginRequest– Time at which this HTTP request began. May be much later than ClientConnected due to client connection reuse.

补充查了下资料：

1.很有可能是客户端的请求是通过重用的客户端socket来传输的；

2. ClientConnected是指从浏览器到Fiddler的socket连接时间

3. 计算准确的响应时间：ClientBeginRequest ~ ClientEndResponse

1. Fiddler作为系统代理，所有来自微软互联网服务（WinInet）的http请求都先经过Fiddler再到Web Server

     Internet Explorer  <-->  WinInet  <--> Fiddler <--> Web Server

2. Fiddler可以做性能测试，HTTP统计视图

3. 如果一个响应没有包含Cache-Control头，那么就不会被缓存在客户端

• ClientDoneRequest -浏览器完成将HTTP请求发送到Fiddler的时间。
  
• DNSTime - # milliseconds Fiddler spent in DNS looking up the server's IP address.
• GatewayDeterminationTime - # milliseconds Fiddler spent determining the upstream gateway proxy to use (e.g. processing autoproxy script). Mutually exclusive to DNSTime.
• TCPConnectTime - # milliseconds Fiddler与服务器建立TCP/IP连接的用时
• HTTPSHandshakeTime – Amount of time spent in HTTPS handshake
• ServerConnected – 与服务器建立连接的时间，由于服务器连接的重用，该时间可能比ClientConnected早。
• FiddlerBeginRequest – The time at which Fiddler began sending the HTTP request to the server.
• ServerGotRequest - Exact time that Fiddler finished (re)sending the HTTP request to the server.
• ServerBeginResponse - Exact time that Fiddler got the first bytes of the server's HTTP response.
• ServerDoneResponse - Exact time that Fiddler got the last bytes of the server's HTTP response.
• ClientBeginResponse - 开始向客户浏览器返回HTTP响应数据的时间.
• ClientDoneResponse- 完成向客户浏览器返回HTTP响应数据的时间.

服务器端处理及响应的时间：ServerBeginResponse - ServerGotRequest

网络传输耗时（上传）：(ServerGotRequest - ClientDoneRequest) - (DNSTime + TCPConnectTime)