[Plugin: WP Super Cache] Nginx and WordPress Super Cache (WordPress MU)

I’m working on moving my bogged down server (over 1000 students, each with their own site in a multisite setup) to a new server running nginx for better performance along with php-fpm.

I’ve gotten nginx and wordpress working, but I can’t seem to get Super Cache working, the timestamps on the pages never match.

I have been following: http://codex.wordpress.org/Nginx

My sites enabled file:

# Redirect everything to the main site.
server {
        listen 80 default;
        server_name *.students.scisdragons.net;
        rewrite ^ http://students.scisdragons.net$request_uri permanent;
}

server {
        listen 80;
        server_name students.scisdragons.net;
        root /var/www/students.scisdragons.net;

        include global/restrictions.conf;
        include global/wordpress-ms-subdir.conf;
}

My WordPress MU file:

# WordPress multisite subdirectory rules.
# Designed to be included in any server {} block.

# This order might seem weird - this is attempted to match last if rules below fail.
# http://wiki.nginx.org/HttpCoreModule
location / {
        try_files $uri $uri/ /index.php?$args;
}

# Add trailing slash to */wp-admin requests.
rewrite /wp-admin$ $scheme://$host$uri/ permanent;

# Directives to send expires headers and turn off 404 error logging.
location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
        expires 48h;
        log_not_found off;
}

# Pass uploaded files to wp-includes/ms-files.php.
rewrite /files/$ /index.php last;

# For multisite:  Use a caching plugin/script that creates symlinks to the correct subdirectory structure to get some performance gains.
set $cachetest "$document_root/wp-content/cache/ms-filemap/${host}${uri}";
if ($uri ~ /$) {
        set $cachetest "";
}
if (-f $cachetest) {
        # Rewrites the URI and stops rewrite processing so it doesn't start over and attempt to pass it to the next rule.
        rewrite ^ /wp-content/cache/ms-filemap/${host}${uri} break;
}

if ($uri !~ wp-content/plugins) {
        rewrite /files/(.+)$ /wp-includes/ms-files.php?file=$1 last;
}

# Uncomment one of the lines below for the appropriate caching plugin (if used).
# include global/wordpress-ms-subdir-wp-super-cache.conf;
# include global/wordpress-ms-subdir-w3-total-cache.conf;

# Rewrite multisite '.../wp-.*' and '.../*.php'.
if (!-e $request_filename) {
        rewrite ^/[_0-9a-zA-Z-]+(/wp-.*) $1 last;
        rewrite ^/[_0-9a-zA-Z-]+(/.*\.php)$ $1 last;
}

# Pass all .php files onto a php-fpm/php-fcgi server.
location ~ \.php$ {
        # Zero-day exploit defense.
        # http://forum.nginx.org/read.php?2,88845,page=3
        # Won't work properly (404 error) if the file is not stored on this server, which is entirely possible with php-fpm/php-fcgi.
        # Comment the 'try_files' line out if you set up php-fpm/php-fcgi on another machine.  And then cross your fingers that you won't get hacked.
        try_files $uri =404;

        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        include fastcgi_params;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
#       fastcgi_intercept_errors on;
        fastcgi_pass php;
}

When I include the following super cache file and restart nginx it doesn’t seem to make a difference:

# WP Super Cache rules.
# Designed to be included from a 'wordpress-ms-...' configuration file.

# Enable detection of the .gz extension for statically compressed content.
# Comment out this line if static gzip support is not compiled into nginx.
gzip_static on;

set $supercacheuri "";
set $supercachefile "$document_root/wp-content/cache/supercache/${http_host}${uri}index.html";
if (-e $supercachefile) {
        set $supercacheuri "/wp-content/cache/supercache/${http_host}${uri}index.html";
}

# If this is a POST request, pass the request onto WordPress.
if ($request_method = POST) {
        set $supercacheuri "";
}

# If there is a query string, serve the uncached version.
if ($query_string) {
        set $supercacheuri "";
}

# Logged in users and those who have posted a comment get the non-cached version.
if ($http_cookie ~* comment_author_|wordpress_logged_in|wp-postpass_) {
        set $supercacheuri "";
}

# Mobile browsers get the non-cached version.
# Wastes CPU cycles if there isn't a mobile browser WP theme for the site.
if ($http_x_wap_profile) {
        set $supercacheuri "";
}

if ($http_profile) {
        set $supercacheuri "";
}

if ($http_user_agent ~* (2.0\ MMP|240x320|400X240|AvantGo|BlackBerry|Blazer|Cellphone|Danger|DoCoMo|Elaine/3.0|EudoraWeb|Googlebot-Mobile|hiptop|IEMobile|KYOCERA/WX310K|LG/U990|MIDP-2.|MMEF20|MOT-V|NetFront|Newt|Nintendo\ Wii|Nitro|Nok$
        set $supercacheuri "";
}

if ($http_user_agent ~* (w3c\ |w3c-|acs-|alav|alca|amoi|audi|avan|benq|bird|blac|blaz|brew|cell|cldc|cmd-|dang|doco|eric|hipt|htc_|inno|ipaq|ipod|jigs|kddi|keji|leno|lg-c|lg-d|lg-g|lge-|lg/u|maui|maxo|midp|mits|mmef|mobi|mot-|moto|mwbp$
        set $supercacheuri "";
}

# Stop processing if the supercache file is valid.
if ($supercacheuri) {
        rewrite ^ $supercacheuri break;
}

http://wordpress.org/extend/plugins/wp-super-cache/