director xxx_htmlbackend round-robin {
        {
                .backend = {
                        .host = "192.168.1.xxx";
                        .port = "xx";
                        .connect_timeout = 20s;
                        .first_byte_timeout = 60s;
                        .between_bytes_timeout = 30s;
                }
        }
        {
                .backend = {
                        .host = "192.168.1.xxx";
                        .port = "xx";
                        .connect_timeout = 20s;
                        .first_byte_timeout = 60s;
                        .between_bytes_timeout = 30s;
                }
        }
        {
                .backend = {
                        .host = "192.168.1.xxx";
                        .port = "xx";
                        .connect_timeout = 20s;
                        .first_byte_timeout = 60s;
                        .between_bytes_timeout = 30s;
                }
        }
        {
                .backend = {
                        .host = "192.168.1.xxx";
                        .port = "xx";
                        .connect_timeout = 20s;
                        .first_byte_timeout = 60s;
                        .between_bytes_timeout = 30s;
                }
        }
        {
                .backend = {
                        .host = "192.168.1.xxx";
                        .port = "xx";
                        .connect_timeout = 20s;
                        .first_byte_timeout = 60s;
                        .between_bytes_timeout = 30s;
                }
        }
}

acl purge {
        "localhost";
        "xx.xx.xx.xx"/24;
        "xx.xx.xx.xx"/29;
}

sub vcl_recv {
        set req.backend = photos_htmlbackend;

        if (req.request != "GET" && req.request != "HEAD" && req.request != "PUT" && req.request != "POST" && req.request != "TRACE" && req.request != "OPTIONS" && req.request != "DELETE") {
                /*
                        Non-RFC2616 or CONNECT which is weird.
                        Shoot this client, but first go in pipeline to the webserver.
                        Maybe he knows what to do with this request.
                */

                return (pipe);
        }

        if (req.http.X-Requested-With == "XMLHttpRequest") {
                return (pass);
        }

        if (req.http.Accept-Encoding) {
                if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") {
                        # No point in compressing these
                        remove req.http.Accept-Encoding;
                } elsif (req.http.Accept-Encoding ~ "gzip") {
                        set req.http.Accept-Encoding = "gzip";
                } elsif (req.http.Accept-Encoding ~ "deflate") {
                        set req.http.Accept-Encoding = "deflate";
                } else {
                        # unkown algorithm
                        remove req.http.Accept-Encoding;
                }
        }

        return(lookup);
}

sub vcl_pipe {
        return (pipe);
}

sub vcl_pass {
        return (pass);
}

sub vcl_hash {
        /*
                Omdat images statisch zijn hoeven we hier niet te kijken naar cookies
                of andere elementen waarop hij zijn cache moet valideren. pretty
                straight forward dus.
        */
        set req.hash += req.url;

        return (hash);
}

sub vcl_hit {
        if (!obj.cacheable) {
                return(pass);
        }

        # Ignore requests via proxy caches,  IE users and badly behaved crawlers
        # like msnbot that send no-cache with every request.
        if (req.http.Cache-Control ~ "no-cache" && ( !(req.http.Via || req.http.User-Agent ~ "bot|MSIE") || (client.ip ~ purge))) {
                set obj.ttl = 0s;
                return (restart);
        }

        return (deliver);
}

sub vcl_miss {
        return (fetch);
}

sub vcl_fetch {
        if (!beresp.cacheable) {
                return (pass);
        }

        #set beresp.grace = 30m;

        return (deliver);
}

sub vcl_deliver {
        remove resp.http.Via;
        remove resp.http.X-Varnish;

        if (obj.hits > 0) {
                set resp.http.X-Cache = "HIT";
        } else {
                set resp.http.X-Cache = "MISS";
        }
        set resp.http.Server = "xxx";

        return (deliver);
}

sub vcl_error {
        set obj.http.Content-Type = "text/html; charset=utf-8";

        synthetic {"
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
        <head>
                <title>"} obj.status " " obj.response {"</title>
        </head>
        <body>
                <h1>Error "} obj.status " " obj.response {"</h1>
                <p>"} obj.response {"</p>
                <h3>Guru Meditation:</h3>
                <p>XID: "} req.xid {"</p>
                <address>
                        <a href="http://xxx.xxx.xxx">Freeones</a>
                </address>
        </body>
</html>
"};

        return (deliver);
}