1.前言
前一段时间想利用fiddlercore截取本地HTTPS的流量做一些分析，按照样例代码的注释学习了一下，没搞清楚怎么实现，后来又在网上查了些资料，对HTTPS的处理提及很少，都没有解决我的问题，主要是HTTPS证书的问题，索性自己研究了一下，终于解决了问题。我会在下篇文章中分享下我的思路，本篇文章先简单分析下fiddlercore自带样例的代码，帮助刚接触fiddlercore的人快速入门，如果有说的不对的地方，欢迎批评指正。
2.源码分析
首先从官网下载FiddlerCoreAPI
https://www.telerik.com/purchase/fiddlercore
下载下来是一个安装文件，解压后有demo和FiddlerCoreAPI库，打开样例代码工程，开始分析。
从主函数开始。
List<Fiddler.Session> oAllSessions = new List<Fiddler.Session>();
定义了一个fiddler的Session类的List，里面存放的是客户端和服务端的消息。
Fiddler.FiddlerApplication.SetAppDisplayName("FiddlerCoreDemoApp");
命名自己的应用程序。
Fiddler.FiddlerApplication.OnNotification += delegate(object sender, NotificationEventArgs oNEA) { Console.WriteLine("** NotifyUser: " + oNEA.NotifyString); };
Fiddler.FiddlerApplication.Log.OnLogString += delegate(object sender, LogEventArgs oLEA) { Console.WriteLine("** LogString: " + oLEA.LogString); };
这两句，第一句绑定了用户通知事件的函数，具体什么时候触发没仔细研究，第二句绑定了FiddlerApplication.Log触发的事件（FiddlerCore自己的日志系统），后面打印内容都会用到，总之这两句就是把内容打印在控制台上。
Fiddler.FiddlerApplication.BeforeRequest += delegate(Fiddler.Session oS)
{
// Console.WriteLine("Before request for:\t" + oS.fullUrl);
oS.bBufferResponse = false;
Monitor.Enter(oAllSessions);
oAllSessions.Add(oS);
Monitor.Exit(oAllSessions);
if ((oS.oRequest.pipeClient.LocalPort == iSecureEndpointPort) && (oS.hostname == sSecureEndpointHostname))
{
oS.utilCreateResponseAndBypassServer();
oS.oResponse.headers.SetStatus(200, "Ok");
oS.oResponse["Content-Type"] = "text/html; charset=UTF-8";
oS.oResponse["Cache-Control"] = "private, max-age=0";
oS.utilSetResponseBody("Request for httpS://" + sSecureEndpointHostname + ":" + iSecureEndpointPort.ToString() + " received. Your request was:
<![CDATA[&quot; + oS.oRequest.headers.ToString());<br>
}<br>
};</p>
<p>BeforeRequest，顾名思义，就是在客户端发送请求后拦截之，在此函数中可以获取甚至修改请求的内容。</p>
<p>oS.fullUrl为请求的URL。</p>
<p>bBufferResponse这个属性，要设置成true才可以修改服务器响应的内容。</p>
<p>接下来的if判断，是一个例子，如果你访问 <a href="https://localhost:7777" target="_blank">https://localhost:7777</a> ，他会拦截你的请求，并构造响应报文返回给你，服务端不会收到该请求。</p>
<p>Fiddler.FiddlerApplication.Startup(iPort, oFCSF);</p>
<p>开启FiddlerCore在指定端口的监听。</p>
<p>oSecureEndpoint = FiddlerApplication.CreateProxyEndpoint(iSecureEndpointPort, true, sSecureEndpointHostname);</p>
<p>建立在指定端口的HTTPS的监听，这个函数下篇文章中还会说到。</p>
<p>至此，这个样例的主要代码就分析完了，它实现了简单的http请求截获和响应替换，剩余的代码都是些与用户的交互，这里不再赘述。</p>
<h2 id="3注意">3.注意</h2>
<p>前面代码执行完后，一定要调用Shutdown()函数关闭FiddlerCore应用，不然会导致浏览器还是通过Fiddler代理，上不了网。</p>
<p>Fiddler.FiddlerApplication.Shutdown();</p>
<p>在证书管理器中可以看到FiddlerCore安装了自己的证书。</p>
<p><img src="http://images2017.cnblogs.com/blog/1209573/201712/1209573-20171220202829131-1078374781.png" alt="" loading="lazy"></p>
<p>阅读样例代码的注释很有帮助，还有FiddlerCore的<a href="http://download.csdn.net/download/u010156775/10164938" target="_blank">帮助文档</a>，里面各个函数的功能说的很详细。</p>
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