Symfony, Varnish, HTTP cache

default.vcl

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

sub vcl_recv
{
	if(req.http.X-Force-Backend)
	{
		return(pass);
	}

	if(req.http.Cookie && req.request ~ "(GET|HEAD)")
	{
		set req.http.X-Cookie = req.http.Cookie;
		remove req.http.Cookie;

		return(lookup);
	}
}

sub vcl_deliver
{
	if(resp.http.Cache-control ~ "(private|no-cache|no-store)" 
		&& !req.http.X-Force-Backend
		&& req.request ~ "(GET|HEAD)"
	)
	{
		set req.http.X-Force-Backend = "YES";
		set req.http.Cookie = req.http.X-Cookie;
		
		remove req.http.X-Cookie;

		return(restart);
	}
}

liip_config.yml

liip_cache_control:
    rules:
        - { path: ^/(admin|login|logout), controls: { public: false } }
        - { controller: ^MyBundle:Controller:partial*, controls: { public: true, s_maxage: 3600, max_age: 3600, last_modified: "-1 hour" }}
        - { path: ^/.*/custom-page, controls: { public: false }}
        - { path: ^/.*/static-page*, controls: { public: true, max_age: 604800, s_maxage: 604800, last_modified: "-1 hour" } }
        - { path: ^/$, controls: { public: true, max_age: 604800, s_maxage: 604800, last_modified: "-1 hour" }, vary: [Accept-Language] }
        - { path: ^/, controls: { public: true, max_age: 604800, s_maxage: 604800, last_modified: "-1 hour" }, vary: [X-User-Language] } # this X-User-Language contains 'es', en', etc. instead of a long browser accept-language string

partial_route.php

<?php

// ...

/**
 * @Route("/partial-action", name="mybundle_controller_partial_whatever")
 * @Template("MyBundle:Controller:_whatever.html.twig")
 */
public function partialWhateverAction()
{
	// look something in the database
	
	return [...];
}