How can I determine if a 404'd site is in javascript and then redirect the browser to another location

Question

I am trying to write a greasemonkey script for firefox that will check the site upon opening and see if the site is 404'd, and then redirect the user to another location.

thank

Answer 1

// ==UserScript==
// @name           Redirect
// @namespace      test
// @include        *
// ==/UserScript==

if (/^about:neterror/.test(document.documentURI))
{
    location.assign(...);
}

Answer 2

Make an AJAX request in the URI and check the response code from the returned XHR object for error code 404 (or! = 200).

Do you have access to some kind of JS Framework?

Answer 3

" " , URL- .

"" - , , .

- .

-, , URL-.

• , . checkRemotePage.php
• checkRemotePage.php
• /checkRemotePage.php ajax, .

url url, apache mod_proxy

• mod_proxy
• ProxyPass/check_remote_page http://www.somehost.com/the_rest_of_the_url