xhr properties in incognito mode

[Brian Kuhn]

I'm wondering if anyone can tell me why XMLHttpRequest objects look different in incognito mode.  

Specifically, I'm interested why the withCredentials property is missing.  I'd like to detect the ability to do cross-domain ajax request (CORS) and the Firefox team suggests looking for withCredentials to detect this capability.  This works in Chrome in normal mode, but not incognito.  Anyone have any suggestions on what else I could look for to detect CORS capability in Chrome incognito?

Thanks,

    Brian

Normal Mode:

new XMLHttpRequest()

XMLHttpRequest

1. onabort: null
2. onerror: null
3. onload: null
4. onloadstart: null
5. onprogress: null
6. onreadystatechange: null
7. readyState: 0
8. responseText: ""
9. responseXML: null
10. status: 0
11. statusText: ""
12. upload: XMLHttpRequestUpload
13. withCredentials: false
14. __proto__: Object

Incognito Mode:

new XMLHttpRequest();

Object

1. abort: function (){return xhrRequest.abort()
2. getAllResponseHeaders: function (){return xhrRequest.getAllResponseHeaders()
3. getResponseHeader: function (header){return xhrRequest.getResponseHeader(header)
4. onreadystatechange: function (){}
5. open: function (method,url,async){if(spy.loaded){spy=new XHRSpy()
6. readyState: 0
7. send: function (data){spy.data=data;
8. setRequestHeader: function (header,value){spy.requestHeaders.push({name:[header],value:[value]});
9. __proto__: Object

[Peter Kasting]

On Wed, Jun 23, 2010 at 9:50 PM, Brian Kuhn <bnk...@gmail.com> wrote:

Specifically, I'm interested why the withCredentials property is missing.  I'd like to detect the ability to do cross-domain ajax request (CORS) and the Firefox team suggests looking for withCredentials to detect this capability.  This works in Chrome in normal mode, but not incognito.  Anyone have any suggestions on what else I could look for to detect CORS capability in Chrome incognito?

+CC abarth

PK 

[Adam Barth]

I'm unable to replicate your results. In the Chrome Dev channel, I
went to http://www.google.com/ in incognito, opened the web inspector,
and typed the following commands:

> var xhr = new XMLHttpRequest()
undefined
> "withCredentials" in xhr
true

Adam

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[Brian Kuhn]

Ah, thank you for humoring me.  It turns out it was Firebug Lite on the page causing this.  I didn't even think to try checking another page since the weirdness only happened in incognito.

Thanks,

   Brian