How To Capture Data with FiddlerCore?

Question

I'm developing a program in c# that will allow me to capture the requests made by the WebBrowser1.

My problem is that the "request data" is always empty. I don't understand where I have to put the "webBrowser1.Navigate" command.

For now my code is as follows.

private void button3_Click(object sender, EventArgs e)
{
    webBrowser1.ScriptErrorsSuppressed = true;
    WebProxy myProxy = new WebProxy();
    Uri newUri = new Uri("http://localhost:8888");
    myProxy.Address = newUri;

    Fiddler.FiddlerApplication.Startup(8888, false, false);

    List<Fiddler.Session> oAllSessions = new List<Fiddler.Session>();

    webBrowser1.Navigate("http://www.youtube.com/");
    while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
    {
        System.Windows.Forms.Application.DoEvents();
    }

    Fiddler.FiddlerApplication.BeforeRequest += delegate(Fiddler.Session oS)
    {
        Monitor.Enter(oAllSessions);
        oAllSessions.Add(oS);
        Monitor.Exit(oAllSessions);
    };

    var message = string.Join(Environment.NewLine, oAllSessions);
    MessageBox.Show(message);

    Fiddler.FiddlerApplication.Shutdown();

}

thanks for the help

Hi, my problem is that the "request data" is always empty. I don't understand where i have to put the "webBrowser1.Navigate" command. Thanks again — Ldg, Dec 05 '12 at 01:11

score 3 · Accepted Answer · answered Dec 05 '12 at 22:24

What "request data" are you referring to?

The core problem here is that you're calling Startup with a false parameter, indicating that Fiddler isn't becoming the proxy for ANY process at all, so you'll never see any data unless you directly send a HTTP request to that proxy instance.

If your goal is to capture traffic from this app and this app only, call

URLMonInterop.SetProxyInProcess("127.0.0.1:8888", "<-loopback>");

after you've started the proxy instance. This will set the current process' WinINET proxy setting to point at the FiddlerCore instance you've started.

Now Works! Thank you so much for the answer! this line save me! URLMonInterop.SetProxyInProcess("127.0.0.1:8888", ""); — Ldg, Dec 06 '12 at 10:45

score 0 · Answer 2 · answered Dec 05 '12 at 01:24

0

I am guessing, but I think you need to re-arrange your code so that you set up fiddler before you make a request:

Fiddler.FiddlerApplication.BeforeRequest += delegate(Fiddler.Session oS)
{
    Monitor.Enter(oAllSessions);
    oAllSessions.Add(oS);
    Monitor.Exit(oAllSessions);
};

webBrowser1.Navigate("http://www.youtube.com/");
while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
{
    System.Windows.Forms.Application.DoEvents();
}

answered Dec 05 '12 at 01:24

Blorgbeard

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hello! thanks for the reply, but even rearranging the code does not still works, the strange thing is that if I open fiddler2 there are requests, but if I point my application as a filter, also fiddler2 receives no request! Thank you again! – Ldg Dec 05 '12 at 08:51

How To Capture Data with FiddlerCore?

2 Answers2