title: How to keep specific query parameters in varnish
body: <p>My Question is maybe a bit strange. Normally you would like to strip specific query parameters from the url to cache in Varnish. But I want to do the opposite of this. This is required for redirecting with some query parameters (like utm_source, etc.)</p>
  
  <p>I have a set of query parameters which does NOT need to be stripped off, the rest can be stripped off.</p>