Wordpress-optimised VCL configuration file for varnish.

default.vcl

# This is a Wordpress-optimised VCL configuration file for varnish.  

backend default {
  .host = "127.0.0.1";
  .port = "8080";
  .connect_timeout = 600s;
  .first_byte_timeout = 600s;
  .between_bytes_timeout = 600s;
  .max_connections = 800;
}

sub vcl_recv {
    set req.http.X-Forwarded-For = client.ip;

    if (req.http.host != "example.com") {
      return(pass);
    }

    #never cache POST requests
    if (req.request == "POST")
    {
      return(pass);
    }

    ### do not cache these files:
    ##never cache the admin pages, or the server-status page
    if (req.request == "GET" && req.url ~ "(wp-admin|bb-admin|server-status|feed)")
    {
      return(pass);
    }

    if (req.request == "GET" && req.url ~ "\.(css|js|gif|jpg|jpeg|bmp|png|ico|img|tga|wmf)$") {
      remove req.http.cookie;
      return(lookup);
    }
    if (req.request == "GET" && req.url ~ "(xmlrpc.php|wlmanifest.xml)") {
      remove req.http.cookie;
      return(lookup);
    }

    ### do not cache these files:
    ##never cache the admin pages, or the server-status page
    if (req.request == "GET" && (req.url ~ "(wp-admin|bb-admin|server-status|feed)"))
    {
      return(pass);
    }

    #DO cache this ajax request
    if(req.http.X-Requested-With == "XMLHttpRequest" && req.url ~ "recent_reviews")
    {
      return (lookup);
    }

    #dont cache ajax requests
    if(req.http.X-Requested-With == "XMLHttpRequest" || req.url ~ "nocache" || req.url ~ "(control.php|wp-comments-post.php|wp-login.php|bb-login.php|bb-reset-password.php|register.php)")
    {
        return (pass);
    }

    if (req.http.Cookie && req.http.Cookie ~ "wordpress_") {
        set req.http.Cookie = regsuball(req.http.Cookie, "wordpress_test_cookie=", "; wpjunk=");
    }
    ### don't cache authenticated sessions
    if (req.http.Cookie && req.http.Cookie ~ "(wordpress_|PHPSESSID)") {
        return(pass);
    }

    ### parse accept encoding rulesets to make it look nice
    if (req.http.Accept-Encoding) {
        if (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;
        }
    }

    if (req.http.Cookie)
    {
        set req.http.Cookie = ";" req.http.Cookie;
        set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
        set req.http.Cookie = regsuball(req.http.Cookie, ";(vendor_region|PHPSESSID|themetype2|w3tc_referrer)=", "; \1=");
        set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");
        set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");

        if (req.http.Cookie == "") {
        remove req.http.Cookie;
        }
    }

    return(lookup);
}