Gzip compression with nginx
In my nginx.conf I have:
gzip on;
gzip_static on;
gzip_buffers 16 8k;
gzip_comp_level 9;
gzip_http_version 1.0;
gzip_min_length 1000;
gzip_types text/plain text/css image/x-icon image/bmp image/png image/gif image/jpeg image/jpg application/json application/x-javascript text/javascript;
gzip_vary on;
gzip_proxied any;
So, if I fetch the headers of a picture on my server:
spiroo@glamdring:~$ curl -I http://static.mysite.com/g/pics/big_6e1855d844ebca560379139e75942f669655f.jpeg
HTTP/1.1 200 OK
Server: nginx
Date: Thu, 04 Apr 2013 13:00:20 GMT
Content-Type: image/jpeg
Content-Length: 5336
Last-Modified: Mon, 25 Mar 2013 13:28:02 GMT
Expires: Fri, 04 Apr 2014 13:00:20 GMT
Cache-Control: max-age=31536000
Pragma: public
Cache-Control: public, must-revalidate, proxy-revalidate
Accept-Ranges: bytes
But if I turn off the gzip compression in nginx.conf, I have exactly the same result on the Content-Length.
What am I doing wrong?
Thanks in advance.
PS: Just to be clear, I have the nginx last release, and I am behind a proxy (haproxy).
EDIT ==>
I have the same problem with the CSS. I understand jpeg are already compressed. Of crouse, when I switch gzip on/off I restart nginx.
This is my fetch from the headers of a css file. I have the same Content-Lenght with or without gzip compression.
spiroo@glamdring:~$ curl -I http://static.mysite.com/css/9a7f503b.css
HTTP/1.1 200 OK
Server: nginx
Date: Thu, 04 Apr 2013 14:21:50 GMT
Content-Type: text/css
Content-Length: 203088
Last-Modified: Tue, 02 Apr 2013 11:34:39 GMT
Vary: Accept-Encoding
Expires: Fri, 04 Apr 2014 14:21:50 GMT
Cache-Control: max-age=31536000
Pragma: public
Cache-Control: public, must-revalidate, proxy-revalidate
Accept-Ranges: bytes
And this is the nginx configuration for my statics files:
server {
server_name static.mysite.com;
root /home/www/mysite/current/web;
location / {
return 404;
}
location ~ \.(?:jpg|jpeg|js|css|gif|png|swf|ico|pdf)$ {
expires 365d;
access_log off;
add_header Pragma public;
add_header Cache-Control "public, must-revalidate, proxy-revalidate";
}
}
Solution 1:
curl
doesn't Accept-Encoding: gzip
by default. You will need to either use -H "Accept-Encoding: gzip,deflate"
to get curl to request gzip or better yet, use --compressed
so curl will know to decompress the result.
Solution 2:
Pictures (jpg/gif etc) are already compressed. So you don't need to (and shouldn't try to) compress them on the web server.
Here is an example of what I compress:
gzip_types text/html text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript image/x-icon image/bmp;