A generic Varnish Cache worldpress VCL template

wordpress.vcl

# Worldpress Varnish Cache VCL template
# 12/21/2016

vcl 4.0;

backend wordpress {
  .host = "0.0.0.0";
  .port = "0";
}

acl purge_hosts {
  "127.0.0.1";
}

sub vcl_recv {
  set req.backend_hint = wordpress;

  if (req.method == "PURGE") {
    if (!(client.ip ~ purge_hosts)) {
        return(synth(405,"Not allowed."));
    }
    return (purge);
  }

  if (req.http.cookie ~ "wordpress_logged_in") {
    return(pass);
  }

  if ((req.url ~ "wp-(login|admin)") || (req.url ~ "preview=true")) {
    return(pass);
  }

  unset req.http.cookie;
}

sub vcl_backend_response {
  #do TTL overrides here
  set beresp.grace = 1d;
}