varnish

backend default {
   .host = "127.0.0.1";
    .port = "81";
}

sub vcl_recv {
	set req.backend = default;
	######XAV#####
	if (req.url ~ "\.(png|gif|jpg|jpeg|js|css|ico|pdf)$")
	{
		unset req.http.Cookie;
		#return (lookup);
	}

	######/XAV####
    if (req.restarts == 0)
	{
		if (req.http.x-forwarded-for)
		{
			set req.http.X-Forwarded-For =
			req.http.X-Forwarded-For + ", " + client.ip;
		}
		else
		{
			set req.http.X-Forwarded-For = client.ip;
		}
    }
    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. */
        return (pipe);
    }
    if (req.request != "GET" && req.request != "HEAD") {
        /* We only deal with GET and HEAD by default */
        return (pass);
    }
    if (req.http.Authorization || req.http.Cookie) {
        /* Not cacheable by default */
        return (pass);
    }
    return (lookup);
}

sub vcl_pipe {
    # Note that only the first request to the backend will have
    # X-Forwarded-For set.  If you use X-Forwarded-For and want to
    # have it set for all requests, make sure to have:
    # set bereq.http.connection = "close";
    # here.  It is not set by default as it might break some broken web
    # applications, like IIS with NTLM authentication.
    return (pipe);
}

sub vcl_pass {
    return (pass);
}

sub vcl_hash {
    hash_data(req.url);
    if (req.http.host) {
        hash_data(req.http.host);
    } else {
        hash_data(server.ip);
    }
    return (hash);
}

sub vcl_hit {
    return (deliver);
}

sub vcl_miss {
    return (fetch);
}

sub vcl_fetch {
	# 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);

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

    if (beresp.ttl <= 0s ||
        beresp.http.Set-Cookie ||
        beresp.http.Vary == "*") {
		/*
		 * Mark as "Hit-For-Pass" for the next 2 minutes
		 */

		set beresp.ttl = 120 s;
		return (hit_for_pass);
    }
    return (deliver);
}

sub vcl_deliver {
	if (obj.hits > 0)
	{
		set resp.http.X-Cache = "HIT";
		set resp.http.X-Cache-Hits = obj.hits;
	#   set resp.http.X-Cache-Backend = req.backend;
    }
	else
	{
        set resp.http.X-Cache = "MISS";
    }


	#remove resp.http.X-Varnish;
    remove resp.http.Via;
    remove resp.http.Age;
	remove resp.http.X-Powered-By;

    return (deliver);
}

sub vcl_error {
    set obj.http.Content-Type = "text/html; charset=utf-8";
    set obj.http.Retry-After = "5";
    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>
    <hr>
    <p>Varnish cache server</p>
  </body>
</html>
"};
    return (deliver);
}

sub vcl_init {
	return (ok);
}

sub vcl_fini {
	return (ok);
}