Getting "Access to Restricted URI denied" error, but not using Cross-Domain??

I'm creating an web mapping application with AJAX functionality. I'm also a little new to the use of AJAX so this is my first time using this.

So I retrieve an XML file through my own web server. But the thing is, I'm getting this error message (Error code 1012) on my Error Console on Firefox, even though I'm not using any cross-domain referencing. The application works perfectly fine on IE though.

I'm not sure if it has to do with the fact that I'm using a port number within the URL for the GET call (see code below).

Here is a snippet of my javaScript file:

Code:

---

// initialize the XMLHttpRequest object
if (window.XMLHttpRequest) {
        // If IE7, Mozilla, Safari, and so on: Use native object.
        xhr = new XMLHttpRequest();
} else {
        if (window.ActiveXObject) {
                // ...otherwise, use the ActiveX control for IE5.x and IE6.
                xhr = new ActiveXObject('MSXML2.XMLHTTP.3.0');
        } else {
                alert('XMLHttpRequest not supported. Your browser does not support XMLHttpRequest');
        }
}

// handle xhr callback
xhr.onreadystatechange  = function(){
        if(xhr.readyState  == 4) { // if done loading url
                if(xhr.status  == 200) {// if url is ok
                        myFunctionToHandleResponse(xhr.responseXML);
                }else {
                        alert('An error occurred. XMLHttpRequest status code: ' + xhr.status);
                }
        }
}

// example URL format I'm using
url = "http://webfeed.mywebserver.ca:9090/?SERVICE=EXT"
url+= "&REQUEST=GetWarningInfo&INFO_FORMAT=text/xml
url+= "&LON=58.446798&LAT=60.654948&TIME=2009-05-11T17:00:00Z"
url+= "&MOREQUERY=blahblah"


// AJAX call
xhr.open('GET',url, true);
xhr.send(null);

---

My html file is on the same domain as my data feed:
http://webfeed.mywebserver.ca/folder1/myhtml.html

The URL returns basically an XML file.

Anyone have any idea what my issue is? I'm completely stumped on this. Any help would be much appreciated.

Even though you may be executing this on the same domain, because you supplied the full http://... the browser assumes it is cross-domain. You need to use relative paths when working with AJAX.

So what would be the relative path format? I tried doing:
"../:9090/?SERVICE=EXT&QUERY=blahblah"
But I don't think it's right. How would you specify a relative path and having to specify the port number into it?

You can't with a port number.

Well that answers my suspicion about that. Looks like I will have to setup a proxy to get around this.

Thanks for the help though. Much appreciated.