Broken caching of static resources in IE ---------------------------------------- Key: RF-13294 URL: https://issues.jboss.org/browse/RF-13294 Project: RichFaces Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 3.3.3.Final Reporter: Nicholas Oxhøj Fix For: 3.Future There seems to be a problem with the caching headers sent by RichFaces in relation to IE (IE8 at least which is the one I have tested). The default for RichFaces, is to tell the browser to cache static resources for 24 hours: {code} HTTP/1.1 200 OK Server: Apache-Coyote/1.1 Cache-control: max-age=86400 Last-Modified: Tue, 29 Oct 2013 13:01:56 GMT Expires: Wed, 30 Oct 2013 13:02:39 GMT Content-Type: text/javascript Content-Length: 117992 Date: Tue, 29 Oct 2013 13:02:39 GMT {code} But it seems that when IE, after 24 hours, validates the file with a "If-Modified-Since" and receives a "304 Not Modified" response {code} HTTP/1.1 304 Not Modified Server: Apache-Coyote/1.1 Date: Tue, 29 Oct 2013 13:07:56 GMT {code} it will *keep* re-validating the file on all subsequent pages/uses, whereas e.g. FireFox _seems_ to reapply the "max-age" of 24 hours, that it was told on the initial GET of the file. I haven't been able to find any specifications, blog posts or anything else related to how the browser should react _after_ having received a "304 Not Modified" response. But it seems that if you add a "Cache-control: max-age=..." header to the "304 Not Modified" response in InternetResourceService#serviceResource(), IE will not re-validate the file until that max-age has expired. {code} HTTP/1.1 304 Not Modified Server: Apache-Coyote/1.1 Cache-control: max-age=86400 Date: Tue, 29 Oct 2013 13:07:56 GMT {code}