# NEWBIE: cache swf content? **URL:** \ **Category:** NGINX\ **Created:** [September 12, 2012, 3:29pm UTC](https://www.ruby-forum.com/t/newbie-cache-swf-content/222843 "2012-09-12T15:29:22Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\ **Post date:** [September 12, 2012, 3:29pm UTC](https://www.ruby-forum.com/t/newbie-cache-swf-content/222843/1 "2012-09-12T15:29:22Z")
I am running a few webapps on Tomcat, and placing nginx in front for SSL, content caching and to remove some of the load from Tomcat where possible (currently testing v1.2.3 on CentOS 6.x). I have most of the configuration working well (nginx is very slick, and pretty easy to configure). However, I have some static content like swf (flash) files that are served to the client browser with parameters, and I think this is why nginx is not caching them. For example, “…/testflash.swf?dt=0123456789” (dt is typically a timestamp, but is a unique identifier, nonetheless). Since this swf file does not actually change (incredibly rarely, in a major “upgrade”, and I would purge the cache at that point), is there a way to tell nginx to cache it regardless of the url-parameters appended? These files, and most of the other content, have ETag’s and Last-Modified-Date (both). In this case there is no explicit Cache-Control in the header. Related question: If content has an ETag from the source server (the content that nginx fetches already has an ETag), is there a way to force nginx to cache the content based on that ETag? I _think_ this is different to the ETag support that is coming in the \> 1.3.3 versions, as that seems to say that it will actually add tags for content. In this case, I would’ve expected nginx to cache any content with an ETag and especially with a Last-Modified-Date when no explicit Cache-Control header was provided. Thanks for dealing with my newbie questions, I appreciate your time. -AJ