It is worth mentioning for others that if you are using 
ring.middleware.defaults/wrap-defaults then this middleware is already in play.

> On 19 Jun 2015, at 10:53, James Reeves <ja...@booleanknot.com> wrote:
> 
> Ring doesn't set any caching headers unless you add in middleware to do so.
> 
> The most common middleware is wrap-not-modified, which returns a 304 response 
> if the etag or last-modified dates indicate the resource hasn't been 
> modified. For resources in jar files, the last-modified date is set to the 
> modification date of the containing jar.
> 
> You could add some middleware to force the browser not to cache resources via 
> the cache-control header (see here 
> <https://stackoverflow.com/questions/49547/making-sure-a-web-page-is-not-cached-across-all-browsers>),
>  or if this is just for development, then Chrome at least has a checkbox in 
> the developer tools for disabling caching.
> 
> - James
> 
> On 19 June 2015 at 10:00, Colin Yates <colin.ya...@gmail.com 
> <mailto:colin.ya...@gmail.com>> wrote:
> Hi all, is there a quick way to disable caching for everything or 
> alternatively hash based on the contents of the resource. I am talking 
> specifically about CSS and javascript issues served from the JAR's class path?
> 
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