Shoutbox

Simplest way is to use no-caching headers.

There are also some tricks, like using a random get parameter in the url to trick the cache into thinking it's a new url.

quote:

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Originally posted by Wikipedia
Alternatively, it is possible to force the XMLHttpRequest object to retrieve the content anyway, as shown in this example.

req.open( "GET", "xmlprovider.php" );
req.setRequestHeader( "If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT" ); //This line doesn't work.
req.send( null );

Another method is to add a random string on the end of the url in the query:

req.open( "GET", "xmlprovider.php?sid=" + Math.random());

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Wikipedia article about XMLHTTP