How to prevent Ajax/javascript result caching in browsers?

Question

How to prevent browsers from caching Ajax results? I have and event triggered Ajax script the displays results only when the browsers data has been cleared.

Tested in IE6 and Firefox 3.0.10

Answer 1

The random URL works, but it's kind of a hack. HTTP has solutions built in that should work. Try using the solution indicated here. Basically, set the headers:

"Pragma":            "no-cache",
"Cache-Control":     "no-store, no-cache, must-revalidate, post-check=0, pre-check=0",
"Expires":           0,
"Last-Modified":     new Date(0), // January 1, 1970
"If-Modified-Since": new Date(0)