How do we cache an ajax response in Rails, so that we dont need to do an ajax the next time ?

It’s the question I’m facing on building an application that is AJAX-heavy, and it’s becoming important for the application to be high-performance.

After some googling, I came across several stuff. One is this interesting article on setting ‘Expires’ header in the HTTP response.

But well, I dont really know how to implement that in Rails.

Anyway his book, High Performance Websites seems like a very good book to buy!

So to cache an ajax response, I use the solution on this site.

Here is a simpler version of that:


<script>
var cache = new Array;
function myscript(somevalue) {
var url = "ajax/function?someparam=somevalue";
if (cache[url]) {
eval(cache[url]);
} else {
new Ajax.Request(url, {asynchronous:true, evalScripts:true,
onComplete:function(request) {
if(request.status == 200) { cache[url] = request.responseText; }
}});
}
</script>