Configuring Nginx to be a Cache for PHP-FPM

scaling_php_application.conf

# This is the sample from Scaling PHP applications book 

#Set the path where the cache is stored; Set the zone name(my_app), totalsize (100m),and max life time(60m)
fastcgi_cache_path /tmp/cachelevels=1:2keys_zone=my_app:100minactive=60m;

#Set the cache key used,in this case: httpsGETtest.com/somepage.html
fastcgi_cache_key "$scheme$request_method$host$request_uri";

server{
	listen 80;
	root /u/apps/my_app;

	location ~ \.php$ {
		//fastcgi_pass config

		# Use the zone name we defined on line 1
		fastcgi_cache my_app;

		# Only cache HTTP 200 responses (no error pages)
		fastcgi_cache_valid 200 60m;

		# Only enable for GET and HEAD requests (no POSTs)
		fastcgi_cache_methods GET HEAD;

		# Bypass the cache if the request contains HTTP Authorization
		fastcgi_cache_bypass $http_authorization;

		# Bypass the cache if the response contains HTTP Authorization
		fastcgi_no_cache $http_authorization;

		# Add a debugging header to show if the page came from cache
		add_header X-Fastcgi-Cache $upstream_cache_status;
	}
}

wordpress.conf

fastcgi_cache_path /var/run/nginx-cache levels=1:2 keys_zone=WORDPRESS:100m inactive=60m;
fastcgi_cache_key "$scheme$request_method$host$request_uri";
fastcgi_cache_use_stale error timeout invalid_header http_500;
fastcgi_ignore_headers Cache-Control Expires Set-Cookie;

server{
	listen 80;
        
	charset utf-8;
    	set $skip_cache 0;
    	# POST requests and urls with a query string should always go to PHP
	if ($request_method = POST) {
		set $skip_cache 1;
	}
	if ($query_string != "") {
		set $skip_cache 1;
	}

	# Don't cache uris containing the following segments
	if ($request_uri ~* "/wp-admin/|/xmlrpc.php|wp-.*.php|/feed/|index.php|sitemap(_index)?.xml") {
		set $skip_cache 1;
	}

	# Don't use the cache for logged in users or recent commenters
	if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in")        {
		set $skip_cache 1;
	}
	location ~ \.php$ {
		# Use the zone name we defined on line 1
		fastcgi_cache WORDPRESS;

		# Only cache HTTP 200 responses (no error pages)
		fastcgi_cache_valid 200 60m;

		# Only enable for GET and HEAD requests (no POSTs)
		fastcgi_cache_methods GET HEAD;

		# Bypass the cache if the request contains HTTP Authorization
		fastcgi_cache_bypass $http_authorization;

		# Bypass the cache if the response contains HTTP Authorization
		fastcgi_no_cache $http_authorization;

		# Add a debugging header to show if the page came from cache
		add_header X-Fastcgi-Cache $upstream_cache_status;
		
		fastcgi_intercept_errors off;
		fastcgi_buffer_size 16k;
		fastcgi_buffers 4 16k;
		fastcgi_cache_bypass $skip_cache;
		fastcgi_no_cache $skip_cache;
		fastcgi_cache WORDPRESS;
		fastcgi_cache_valid  60m;
	}
	location ~ /purge(/.*) {
        	fastcgi_cache_purge WORDPRESS "$scheme$request_method$host$1";
	}
}