schleppe-ha-project/ansible/roles/varnish/templates/includes/x-cache-header.vcl.j2

sub vcl_recv {
  unset req.http.X-Cache;
}

sub vcl_hit {
  set req.http.X-Cache = "HIT";
}

sub vcl_miss {
  set req.http.X-Cache = "MISS";
}

sub vcl_pass {
  set req.http.X-Cache = "PASS";
}

sub vcl_pipe {
  set req.http.X-Cache = "PIPE uncacheable";
}

sub vcl_synth {
  set resp.http.X-Cache = "SYNTH";
}

sub vcl_deliver {
  if (obj.uncacheable) {
    set req.http.X-Cache = req.http.X-Cache + " uncacheable" ;
  } else {
    set req.http.X-Cache = req.http.X-Cache + " cached" + " (real age: " + resp.http.Age + ", hits: " + obj.hits + ", ttl: " + regsub(resp.http.x-ttl, "\..*", "") + ")";
  }

  # if we are gracing, make sure the browser doesn't cache things, and set our maxage to 1
  # also log grace delivery
  if (req.http.graceineffect) {
    set resp.http.Cache-Control = regsub(resp.http.Cache-Control, "max-age=[0-9]*", "max-age=1");
    set resp.http.Cache-Control = regsub(resp.http.Cache-Control, "channel-maxage=[0-9]*", "channel-maxage=1");
    set req.http.X-Cache = req.http.X-Cache + " [grace: " + req.http.graceineffect + " " + req.http.grace + ", remaining: " + req.http.graceduration + "]";
  }

  # uncomment the following line to show the information in the response
  set resp.http.X-Cache = req.http.X-Cache;
}