resize and crop images using nginx image_filter module with cache support

nginx.conf

# My project directory is /home/rahit/www/mysite. I am storing cache file in my project folder under cache folder.
# You can use any of your prefered location in system. may be: /tmp/nginx
# I am naming keys_zone name my_cache. You can give it yours. We will need it later on in proxy_cache.
# Just make sure you put same zone name there
proxy_cache_path /home/rahit/www/mysite/cache levels=1:2 keys_zone=my_cache:10m max_size=1G;



# This is our media server, which will be used to resize and crop.
server {
	listen 80;
	server_name media.loc;
	root /home/rahit/www/mysite;

	# exaple url: /resize/<WIDTH>/<HEIGHT>/<IMAGE_PATH_FROM_ROOT>
	# /resize/100/-/logo.jpg
	# /resize/-/100/logo.jpg
	location ~* ^/resize/([\d\-]+)/([\d\-]+)/(.+)$ {
	    alias /home/rahit/www/mysite/$3;
	    image_filter resize $1 $2;
	    image_filter_buffer 2M;
	    error_page 415 = /empty;
	}

	# exaple url: /crop/<WIDTH>/<HEIGHT>/<IMAGE_PATH_FROM_ROOT>
	# /crop/100/-/logo.jpg
	# /crop/-/100/logo.jpg
	location ~* ^/crop/([\d\-]+)/([\d\-]+)/(.+)$ {
	    alias /home/rahit/www/mysite/$3;
	    image_filter crop $1 $2;
	    image_filter_buffer 2M;
	    error_page 415 = /empty;
	}

	location = /empty {
	    empty_gif;
	}
}


# Here is our main server setting.
server {
	listen 80;
	root /home/rahit/www/mysite;
	server_name mysite.loc www.mysite.loc;
	
	# If we see an url which satisfy following regex we will pass this request to media server.
	# Also we are going to cache the result we get from media server.
	location ~* ^/(resize|crop)/ {
	    proxy_pass http://media.loc:80;
	    proxy_cache my_cache;
	    proxy_cache_key "$host$document_uri";
	    proxy_cache_valid 200 1d;
	    proxy_cache_valid any 1m;
	    proxy_cache_use_stale error timeout invalid_header updating;
	}
}