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Re: XMLHttpRequest error handling: msg#00029

Subject: Re: XMLHttpRequest error handling
Chuck Musser wrote:

I've tried to access the XMLHttpRequest object's channel attribute to query its status, but I get this exception "Permission denied to create wrapper for object of class UnnamedClass".

Is there a primer on how to write robust XMLHttpRequest()-based code? If I could acquire the raw information, I'd try writing one myself. Right now I'm stuck.

Chuck

I'm now testing from chrome, which eliminates the permissions problems.

I've tried to QueryInterface() the XMLHttpRequest's channel attribute to an nsITransportRequest, so I could access the nsITransportRequest's status attribute. Unfortunately, this generates an warning that says "Reference to undefined property Components.interfaces.nsITransportRequest". Bummer.

2.) The interface map defined in nsXMLHttpRequest.cpp shows that the interface can be QI'ed to nsIRequestObserver. That looks promising, but its documentation seems to indicate that it only works for asynchronous requests. My code currently uses a synchronous XMLHttpRequest. Does the request observer work for those too? How do I set up a request observer for my XMLHttpRequest?

Chuck


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