To simplify adding cache headers to pages, the upcoming 6.0.11 release adds support for the @@proxyCacheTimeout decorators to webskins. This value specifies the number of seconds that webskin should be cached for. The smallest value specified when constructing a page is added to the header using the max-age and s-maxage headers, or as a set of no-cache headers if 0.
By default, FarCry doesn't add cache headers when no webskin specifies a proxy cache timeout. Use the defaultProxyCacheTimeout constructor setting to change this behaviour. To default to a 2 minute cache:
<cfset this.defaultProxyCacheTimeout = 120 />
If you want FarCry to default to no-cache headers:
<cfset this.defaultProxyCacheTimeout = 0 />
META tags and an html comment are added to the page with the response headers. These can help troubleshoot issues with reverse proxies. e.g.:
<META HTTP-EQUIV="Cache-Control" CONTENT="max-age=120,s-maxage=120" /><!-- Page cached until: Mon, 28 Feb 2011 10:40:58 GMT+11 (120 seconds) -->
Example Cache Header
Cache-Control max-age=120,s-maxage=120
We use max-age instead of Expires because of time zone complications. Effective use of Expires requires the correct time on the web server, the reverse proxy (or any proxies between the web server and the user), and the user's own computer.
Example No Cache Header
Expires Tue, 01 Jan 1985 00:00:01 GMT Pragma no-cache cache-control no-cache, no-store, must-revalidate