Redirecting Request (nsiHttpChannel?) in Firefox Extensions

Question

I\'ve been trying at this for a long time now, and no good results.

var myObserver = {
    observe: function(subject, topic, data)
    {
        if (topic == \"h         


        

Answer 1

I am under the impression that you cannot do this at this level - I tried a variety of methods of externally "tricking" the code that calls for a nsIHttpChannel to be created (example at end of post).

What I would recommend is if you want a redirect, contact the channel's owner window (which works 99% of the time), and instruct it to redirect. I know that it's not going to behave the same, but since I don't know exactly why you're doing this, this will externally (to the user) appear to be doing the same thing as what you ask.

Here's the basics of what I was trying:

if(aTopic == "http-on-examine-response") {                                                                                     
            var request = aSubject.QueryInterface(Components.interfaces.nsIHttpChannel);                                                      

            if(!request.URI.spec.match("^http://www.apple.com/")) {                                                          
                var ios = Components.classes["@mozilla.org/network/io-service;1"]                                                             
                    .getService(Components.interfaces.nsIIOService);                                                                          
                var ch = ios.newChannel("http://www.apple.com/", null, null);                                                                 

                var listener = {                                                                                                              
                    QueryInterface : XPCOMUtils.generateQI([Ci.nsIChannelEventSink]),                                                         
                    onDataAvailable: function() {},                                                                                           
                    onStopRequest: function() {},                                                                                             
                    onStartRequest: function() {}                                                                                             
                };                                                                                                                            

                ch.asyncOpen(listener,null);                                                                                                  

                var eventSink = request.notificationCallbacks.getInterface(Ci.nsIChannelEventSink);                                           
                eventSink.asyncOnChannelRedirect(request,ch,Ci.nsIChannelEventSink.REDIRECT_INTERNAL,function() {});                          
            }