SilverStripe Varnish Cookie handling

gistfile1.txt

  # Remove all cookies that do not match the following rules
  if (
       # Any HTTP POST request
       !(req.request == "POST") &&

       # Admin URLs
       !(req.url ~ "^/admin|Security/") &&
      
       # Allow /dev/build and /dev/tasks URLs
       !(req.url ~ "dev/build/") &&
       !(req.url ~ "dev/tasks/") &&

       # Staging/Previewing URLs while in /admin
       !(req.http.referer ~ "\?stage=Stage$/") &&
       !(req.http.referer ~ "\?stage=Live$/")
   
     )
  {
    unset req.http.Cookie;
  }