title: How do I add headers to files downloaded from ServiceStack's Virtual File System?
body: <p>I am leveraging <code>ServiceStack</code>'s Virtual File System and the <a href="https://github.com/ServiceStack/ServiceStack/wiki/Virtual-file-system#registering-additional-virtual-path-providers" rel="nofollow">code-snippet on the wiki</a> to minify content at startup-time.  However, I don't see a way that I can add in custom headers, like <a href="https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching#cache-control" rel="nofollow">those recommended</a> for <code>Cache-Control</code>, etc.</p>
  
  <p>I could possibly use Global Response Filters, but a) I don't think they play with "static" files, and b) that require some gnarly response logic.</p>
  
  <p>How can I add headers to content served by a <code>IVirtualPathProvider</code> in ServiceStack?</p>