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Editorial Team
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Asked: 2026-05-15T10:33:06+00:00

I’ve got some code that does an ajax request using jQuery, and handles success

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I’ve got some code that does an ajax request using jQuery, and handles success and error conditions. On an error, I want to find out what the URL I called was, so I can log it. This information appears to be contained in the XMLHttpRequest.channel, but firefox is complaining about accessing this – 

Permission denied for <http://localhost:8081> to get property XMLHttpRequest.channel

Any ideas how I can determine the URL associated with an XMLHttpRequest? What’s the security issue getting hold of this information? Cheers,

Colin

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1 Answer

  1. Editorial Team

    The security issue is cross domain XHR requests.

    In FF2 you used to be able to override this in about:config, also see this blog and especially this preference:

    user_pref("capability.policy.default.XMLHttpRequest.channel", "allAccess");

    But that’s all not possible anymore in FF3. And with a good reason.

    Note that XMLHttpRequest.channel is Gecko-specific, so this wouldn’t have worked in non-Gecko browsers.

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