backend apache {
    .host = "127.0.0.1";
    .port = "8080";
}

acl purge {
        "localhost";
        "127.0.0.1";
}

sub vcl_recv {
	// Attempt to pass the client ip through varnish from the load balancer
	remove	req.http.X-Forwarded-For;
	set	req.http.X-Forwarded-For = req.http.X-Cluster-Client-IP;

	// Strip cookies for static files:
	if (req.url ~ "\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|pdf|txt|tar|wav|bmp|rtf|js|flv|swf|html|htm)$") {
		unset req.http.Cookie;
		return(lookup);
	}

	// Remove has_js and Google Analytics __* cookies.
	set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(__[a-z]+|has_js)=[^;]*", "");

	// Remove a ";" prefix, if present.
	set req.http.Cookie = regsub(req.http.Cookie, "^;\s*", "");

	// Remove empty cookies.
	if (req.http.Cookie ~ "^\s*$") {
		unset req.http.Cookie;
	}

	if (req.request == "PURGE") {
		if (!client.ip ~ purge) {
			error 405 "Not allowed.";
		}
		ban ("req.url ~ " + req.url + " && req.http.host == " + req.http.host);
		error 200 "Purged.";
	}
}

sub vcl_hash {
  if (req.http.Cookie) {
    hash_data(req.http.Cookie);
  }
}

sub vcl_fetch {

	// Strip cookies for static files:
	if (req.url ~ "\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|pdf|txt|tar|wav|bmp|rtf|js|flv|swf|html|htm)$") {
		unset beresp.http.set-cookie;
	}

	// Varnish determined the object was not cacheable
	if (beresp.ttl == 0s) {
		set beresp.http.X-Cacheable = "NO:Not Cacheable";
	}

	// You don't wish to cache content for logged in users
	elsif(req.http.Cookie ~"(UserID|_session)") {
		set beresp.http.X-Cacheable = "NO:Got Session";
		return(hit_for_pass);
	}

	// You are respecting the Cache-Control=private header from the backend
	elsif ( beresp.http.Cache-Control ~ "private") {
		set beresp.http.X-Cacheable = "NO:Cache-Control=private";
		return(hit_for_pass);
	}

	// You are extending the lifetime of the object artificially
	elsif ( beresp.ttl < 1s ) {
		set beresp.ttl   = 300s;
		set beresp.grace = 300s;
		set beresp.http.X-Cacheable = "YES:Forced";
	}

	// Varnish determined the object was cacheable
	else {
		set beresp.http.X-Cacheable = "YES";
	}

	return(deliver);
}