There are many attractions of Nginx as a front-end to Apache for
WordPress -
not least the retention of permalink facilities.
I have been trying this for some time now and, when it works, the
performance is certainly excellent. However there is one problem with
all
the configurations I have been trying and that is the header image in
the
default WordPress twentyeleven theme when not logged in.
This should load a random image on each refresh but, even though the
image
name should change, the same image is always reloaded.
The platform is Ubuntu 10.04 LTS, nginx 1.2.3 stable, Apache/2.2.14
(Ubuntu), WordPress 3.4.2.
Here is the essential bit from nginx.conf in my current tests:
=============================================================================
proxy_cache_path /var/lib/nginx/cache levels=1:2
keys_zone=staticfilecache:180m max_size=100m;
proxy_temp_path /var/lib/nginx/proxy;
proxy_connect_timeout 30;
proxy_read_timeout 120;
proxy_send_timeout 120;
#IMPORTANT - this sets the basic cache key that’s used in the static
file
cache.
proxy_cache_key “$scheme://$host$request_uri”;
… and the essentail /etc/nginx/conf.d/wordpress.conf file which is
included in every server {} definition:
=============================================================================
# Set the real IP.
proxy_set_header X-Real-IP $remote_addr;
# Set the hostname
proxy_set_header Host $host;
#Set the forwarded-for header.
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
# Let the Set-Cookie header through.
proxy_pass_header Set-Cookie;
location / {
# If logged in, don't cache.
if ($http_cookie ~*
“comment_author_|wordpress_(?!test_cookie)|wp-postpass_” ) {
set $do_not_cache 1;
}
proxy_cache_key “$scheme://$host$request_uri
$do_not_cache”;
proxy_cache staticfilecache;
proxy_pass http://apache;
}
location ~* wp\-.*\.php|wp\-admin {
# Don't static file cache admin-looking things.
proxy_pass http://apache;
}
location ~*
.(jpg|png|gif|jpeg|css|js|mp3|wav|swf|mov|doc|pdf|xls|ppt|docx|pptx|xlsx)$
{
# Cache static-looking files for 120 minutes,
setting a 10 day expiry time in the HTTP header,
# whether logged in or not (may be too
heavy-handed).
proxy_cache_valid 200 120m;
expires 864000;
proxy_pass http://apache;
proxy_cache staticfilecache;
}
location ~* \/[^\/]+\/(feed|\.xml)\/? {
# Cache RSS looking feeds for 45 minutes unless
logged in.
if ($http_cookie ~*
“comment_author_|wordpress_(?!test_cookie)|wp-postpass_” ) {
set $do_not_cache 1;
}
proxy_cache_key “$scheme://$host$request_uri
$do_not_cache”;
proxy_cache_valid 200 45m;
proxy_cache staticfilecache;
proxy_pass http://apache;
}
location = /50x.html {
root /var/www/nginx-default;
}
# No access to .htaccess files.
location ~ /\.ht {
deny all;
}
=============================================================================
So clearly WordPress is not being asked to provide a new header.
Clearly I
can make it do so by setting expires 0 but that rather defeats the
purpose
of having nginx up front.
Any ideas?
Posted at Nginx Forum: