I wanted to try fastcgi_cache on my nginx 1.5.8 as shown here
http://seravo.fi/2013/optimizing-web-server-performance-with-nginx-and-php

In nginx conf, http section, I added:

fastcgi_cache_path /var/cache/nginx levels=1:2 keys_zone=microcache:10m
max_size=1000m inactive=60m;

In server section:
set $cache_uri $request_uri;

# POST requests and urls with a query string should always go to PHP
if ($request_method = POST) {
set $cache_uri 'null cache';
}
if ($query_string != "") {
set $cache_uri 'null cache';
}

# Don't cache uris containing the following segments
if ($request_uri ~*
"(/wp-admin/|/xmlrpc.php|/wp-(app|cron|login|register|mail).php|wp-.*.php|/feed/|index.php|wp-comments-popup.php|wp-links-opml.php|wp-locations.php|sitemap(_index)?.xml|[a-z0-9_-]+-sitemap([0-9]+)?.xml)")
{
set $cache_uri 'null cache';
}

# Don't use the cache for logged in users or recent commenters
if ($http_cookie ~*
"comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_logged_in") {
set $cache_uri 'null cache';
}

location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
include fastcgi.conf;
fastcgi_pass unix:/var/run/php5-fpm.sock;


##
# Fastcgi cache
##
set $skip_cache 1;
if ($cache_uri != "null cache") {
add_header X-Cache-Debug "$cache_uri $cookie_nocache
$arg_nocache$arg_comment $http_pragma $http_authorization";
set $skip_cache 0;
}
fastcgi_cache_bypass $skip_cache;
fastcgi_cache_key
$scheme$host$request_uri$request_method;
fastcgi_cache_valid any 8m;
fastcgi_cache_bypass $http_pragma;
fastcgi_cache_use_stale updating error timeout
invalid_header http_500;

}

I chowned /var/cache/nginx to www-data user (and group) and chmodded it to
775.
I restarted nginx but the folder is always empty. Is it normal? How can I
test if fastcgi_cache is working?

Thanks in advance
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