Fiddler 修改响应内容

1. 导入 FiddlerCore.dll 第三方库。

2. 开启侦听端口，FiddlerApplication.Startup(8888, FiddlerCoreStartupFlags.Default);

3. 设置响应可写，

FiddlerApplication.BeforeRequest += t>
{
if (t.uriContains("cnblogs"))
{
t.bBufferResponse = true;
}
};

4. 修改响应，

FiddlerApplication.BeforeResponse += t =>
{
if (t.fullUrl.Contains("cnblogs"))
{
var document = new HtmlDocument();

using (var stream = new MemoryStream(Encoding.GetEncoding(936).GetBytes(t.GetResponseBodyAsString())))
{
document.Load(stream);
}

var a = t.GetResponseBodyAsString();

document.LoadHtml(a.Replace("博客园", "博客论坛"));

using (var stream = new MemoryStream())
{
document.Save(stream, Encoding.UTF8);

t.ResponseBody = stream.ToArray();
}
}
};

5. 停用侦听（很重要），FiddlerApplication.Shutdown()。