title: How to invalidate HTTP Cache Headers on static files
body: <p>I have set a CacheControl declaration in my .htaccess for browsers to cache static files.</p>
  
  <p>Upon successive deployments, how can I define an instruction to invalidate the client's cache? </p>
  
  <pre><code>&lt;Files *.js&gt;
  Header add "Cache-Control" "max-age=604800"
  &lt;/Files&gt;
  </code></pre>