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During the page load there are number of HTTP requests for document itself and its requisites. How do i hook them, retrieve target URL and prevent request from being sent if certain condition met? Plug-ins can also issue HTTP requests, i would like to cover them too.

user422039
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    Hey take look at this may be helpful for you https://developer.mozilla.org/en/XUL_School/Intercepting_Page_Loads#HTTP_Observers – Aditya Apr 16 '11 at 16:33
  • @Aditya, seems to be right observer type for the job, thanks! – user422039 Apr 16 '11 at 16:41
  • See my answer to this question: http://stackoverflow.com/questions/5205672/modify-url-before-loading-page-in-firefox – Wayne Apr 16 '11 at 21:37

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There are several ways to issue a redirect:

* Server-side: You configure your web server to issue a 300 HTTP response code (most commonly 301 ("moved permanently") or 302 ("found"/"moved temporarily")), with a Location header set to the new URL.
* Client-side: You include the http-equiv="refresh" attribute in the meta tag or set the JavaScript window.location  object (with or without the replace() method) in the head of the HTML document.