Firing off some url requests (GET) after page load
<p>After a user logs off from our web-site we need to fire off some HTTP requests to 2-3 other external urls (we don't need a response from these btw).</p>

<p>The url request must be performed on the client as the requests will cause a log-off to be performed on these external sites on the users current session.</p>

<p>The only way I thought that this could be achieved would be to render some invisible iframes and set the url to each of them so that when the page loads the requests will be executed.</p>

<p>Is there another way this could be achieved?  The above solution seems a bit hacky.</p>

<p>EDIT: I cannot use JS for this as we need to conform to standards.</p>
