Add http header to all requests to GeckoFx

Question

I am trying to figure out a way to add a custom http header to all requests made through geckoFX. I tried to add a header using

GeckoMIMEInputStream strea=new GeckoMIMEInputStream();
strea.AddHeader("head","val"); 
geckoWebBrowser1.Navigate("http://google.com",GeckoLoadFlags.None,"",null,strea);

I need a way to add a custom header, to absolutely ALL requests made when going to a webpage. Thank you

Answer 1

You can implement your own observer (nsIObserver interface) to intercept the http-on-modify-request notification and there add headers.

class Observer: nsIObserver
{
    public void Observe(nsISupports aSubject, string aTopic, string aData)
    {
        var request = Xpcom.QueryInterface<nsIHTTPChannel>(aSubject);
        request.SetRequestHeader(name, value, merge);
    }
}

and register it

Xpcom.GetService<nsIObserverService>("@mozilla.org/observer-service;1").AddObserver(new Observer(), "http-on-modify-request", false);