Updated WordPress VCL – still not complete, but, closer
Worked with a new client this week and needed to get the VCL working for their installation. They were running W3TC, but, this VCL should work for people running WP-Varnish or any plugin that allows Purging. This VCL is for Varnish 2.x.
There are still some tweaks, but, this appears to be working quite well.
backend default {
.host = "127.0.0.1";
.port = "8080";
}
acl purge {
"10.0.1.100";
"10.0.1.101";
"10.0.1.102";
"10.0.1.103";
"10.0.1.104";
}
sub vcl_recv {
if (req.request == "PURGE") {
if (!client.ip ~ purge) {
error 405 "Not allowed.";
}
return(lookup);
}
if (req.http.Accept-Encoding) {
#revisit this list
if (req.url ~ "\.(gif|jpg|jpeg|swf|flv|mp3|mp4|pdf|ico|png|gz|tgz|bz2)(\?.*|)$") {
remove req.http.Accept-Encoding;
} elsif (req.http.Accept-Encoding ~ "gzip") {
set req.http.Accept-Encoding = "gzip";
} elsif (req.http.Accept-Encoding ~ "deflate") {
set req.http.Accept-Encoding = "deflate";
} else {
remove req.http.Accept-Encoding;
}
}
if (req.url ~ "\.(gif|jpg|jpeg|swf|css|js|flv|mp3|mp4|pdf|ico|png)(\?.*|)$") {
unset req.http.cookie;
set req.url = regsub(req.url, "\?.*$", "");
}
if (req.http.cookie) {
if (req.http.cookie ~ "(wordpress_|wp-settings-)") {
return(pass);
} else {
unset req.http.cookie;
}
}
}
sub vcl_fetch {
# this conditional can probably be left out for most installations
# as it can negatively impact sites without purge support. High
# traffic sites might leave it, but, it will remove the WordPress
# 'bar' at the top and you won't have the post 'edit' functions onscreen.
if ( (!(req.url ~ "(wp-(login|admin)|login)")) || (req.request == "GET") ) {
unset beresp.http.set-cookie;
# If you're not running purge support with a plugin, remove
# this line.
set beresp.ttl = 5m;
}
if (req.url ~ "\.(gif|jpg|jpeg|swf|css|js|flv|mp3|mp4|pdf|ico|png)(\?.*|)$") {
set beresp.ttl = 365d;
}
}
sub vcl_deliver {
# multi-server webfarm? set a variable here so you can check
# the headers to see which frontend served the request
# set resp.http.X-Server = "server-01";
if (obj.hits > 0) {
set resp.http.X-Cache = "HIT";
} else {
set resp.http.X-Cache = "MISS";
}
}
sub vcl_hit {
if (req.request == "PURGE") {
set obj.ttl = 0s;
error 200 "OK";
}
}
sub vcl_miss {
if (req.request == "PURGE") {
error 404 "Not cached";
}
}
July 20th, 2011 at 5:53 pm
Modified vcl_recv to whitelist cookies that wordpress uses (wordpress_ and wp-settings-) which will not cache a page if someone is logged in, but, will cache if someone hits the page and Google Analytics or some other plugin that sets cookies is running.
You’ll want to modify that VCL if you have plugins that rely on cookies as well.
July 20th, 2011 at 9:56 pm
Still beta testing this:
if (req.url ~ “\?(utm_(campaign|medium|source|term)|adParams|client|cx|eid|fbid|feed|ref(id|src)?|v(er|iew))=”) {
set req.url = regsub(req.url, “\?.*$”, “”);
}