# Defining your webserver.
backend default {
  .host = "127.0.0.1";
  .port = "81";
}
// Set a header to track a cache HIT/MISS.

sub vcl_deliver {
  if (obj.hits > 0) {
    set resp.http.X-Varnish-Cache = "HIT";
  }
  else {
    set resp.http.X-Varnish-Cache = "MISS";
  }
}
# Incoming request
# can return pass or lookup (or pipe, but not used often)
sub vcl_recv {

  # set default backend
  set req.backend = default;





  if (req.http.Cookie) {
    set req.http.Cookie = ";";

    if (req.http.Cookie == "") {
        remove req.http.Cookie;
    }
  }
  # remove
  unset req.http.Accept-Encoding;

  if (req.backend.healthy) {
    set req.grace = 12h;
  } else {
    set req.grace = 1d;
  }
  set req.ttl = 1d;
  return(lookup);


  #return(pass);
}

# called after recv and before fetch
# allows for special hashing before cache is accessed
sub vcl_hash {

}


# Before fetching from webserver
# returns pass or deliver
sub vcl_fetch {
    # removing cookie
    unset beresp.http.Set-Cookie;

    # Cache for 1 day
    set beresp.ttl = 1d;
    set beresp.grace = 1d;
    set req.ttl = 1d;

    // Don't cache error pages (cache only 2 seconds for scalability issues)
    if (beresp.status == 404 || beresp.status == 503 || beresp.status >= 500){
      set beresp.ttl = 2s;
    }
    return(deliver);

}

# called after fetch or lookup yields a hit
sub vcl_deliver {

}

#
sub vcl_error {

}