Question

Im using firefox 3.6.10, and firebug to debug

So, here is my code:

var xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET", url,false);
xmlhttp.setRequestHeader('Content-Type',  'text/xml');
xmlhttp.send(null);
alert(xmlhttp.responseXML);

responseXML is always null, and i’ve tried it on several URLs from different domains. I have also tried it asynchronously, it’s the same result. The responseText is always properly returned, no problems with it.

My goal is to get the responseXML.documentElement.

Thanks for your help.

EDIT———–
This javascript code was executed from a Greasemonkey userscript, i made surte its the same origin as the requested url. Also i tried executing from firebug console, again ensuring the origin policy. Same error on both.
Gotta hate javascript.

Answer 1

I bet you are violating the same origin policy.

For XHRs, you must have the same protocol, domain, port, etc. So if you are running an app on localhost:8080/app, you CANNOT ajax to http://www.cnn.com.

Different browsers handle this differently; I have seen FF do what you describe, which is the request appears to return normally but there is no data…