How to Set Varnish Cache-Control Headers

Question

I am hoping someone can advise on the proper method for getting Varnish to send cache-control headers. Currently, my configuration is sending \"Cache-Control: no-cac

Answer 1

Your back-end is sending "Cache-Control: no-cache" to Varnish which implies two things:

• Varnish will not store the response in the cache (so a next lookup will fail)
• Your clients (browsers and intermediate proxies) will not cache responses (and request them over and over).

The solution is simple: remove the cache-control headers after fetching the response from the back-end (and before storing them in the cache).

In your vcl file do:

sub vcl_fetch {
  remove beresp.http.Cache-Control;
  set beresp.http.Cache-Control = "public";
}

You can choose to only do this for certain urls (wrap it in ( if req.url ~ "" ) logic) and do way more advanced stuff.