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Editorial Team
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Asked: 2026-05-13T09:27:12+00:00

I am attempting to implement a firefox extension which filters incoming HTTP responses and

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I am attempting to implement a firefox extension which filters incoming HTTP responses and handles them accordingly.

I wish to block HTTP responses containing a specific header. Having read through some of the MDC articles, it appears the most common way of observing HTTP responses is by registering an http-on-examine-response observer.

My question is: Using this observer, is it possible to block the HTTP request from further processing (as a by-product, the page will continue to wait for a response)? Or do I need to use some other facet of XPCOM (if so, care to point me in the right direction)?

Thanks in advance,
Mike

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1 Answer

  1. Editorial Team

    Should be possible: the “subject” of that notification is a HTTP channel, on which you can call nsIRequest::cancel().

    the page will not continue to wait for a response, though, since you blocked the response. Perhaps you’ve been actually looking for a way to alter an HTTP response?

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