I have an image file at https://www.example.com/img/bart-had-a-groove.gif
And this is the only cache block in my site config, there is no caching settings in global nginx.conf.
location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
expires 1M;
access_log off;
add_header Cache-Control "public, no-transform, max-age=2628000";
}
Now, you can see my header is set to Cache-Control "public, no-transform, max-age=2628000";
, but if you CURL the image e.g. curl -X GET -I https://www.example.com/img/bart-had-a-groove.gif
you get:
HTTP/1.1 200 OK
Content-Type: image/gif
Connection: keep-alive
Server: nginx/1.13.9
Content-Length: 771510
Last-Modified: Fri, 17 Feb 2017 17:26:23 GMT
ETag: "58a7323f-bc5b6"
Pragma: public
Cache-Control: public
Accept-Ranges: bytes
Date: Mon, 19 Mar 2018 21:49:33 GMT
Expires: Wed, 18 Apr 2018 21:49:33 GMT
You can see that Cache-Control: public
does not match the config. It's missing the no-transform, max-age=2628000
part.
I run systemctl stop nginx && systemctl start nginx && systemctl reload nginx
after every change.
Update
The rest of server block:
server {
listen 80;
listen 443;
server_name example.com;
return 301 https://www.$server_name$request_uri;
}
server {
listen 80;
listen 443 ssl http2;
root /var/www/example.com/htdocs/;
index index.html index.htm;
server_name www.example.com;
location / {
autoindex on;
try_files $uri $uri/ =404;
}
location ~ \.php$ {
fastcgi_split_path_info ^(.+?\.php)(|/.*)$;
# Security note: If you're running a version of PHP older than the
# latest 5.3, you should have "cgi.fix_pathinfo = 0;" in php.ini.
# See http://serverfault.com/q/627903/94922 for details.
include fastcgi_params;
# Block httpoxy attacks. See https://httpoxy.org/.
fastcgi_param HTTP_PROXY "";
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param QUERY_STRING $query_string;
fastcgi_intercept_errors on;
# PHP 5 socket location.
#fastcgi_pass unix:/var/run/php5-fpm.sock;
# PHP 7 socket location.
fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
}
location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
#expires 1M;
access_log off;
add_header Cache-Control "public, no-transform, max-age=2628000";
}
pagespeed on;
# Needs to exist and be writable by nginx. Use tmpfs for best performance.
pagespeed FileCachePath /var/ngx_pagespeed_cache;
# Ensure requests for pagespeed optimized resources go to the pagespeed handler
# and no extraneous headers get set.
location ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+" {
add_header "" "";
}
location ~ "^/pagespeed_static/" { }
location ~ "^/ngx_pagespeed_beacon$" { }
}
Best Answer
You are using two correlating configuration directives, regarding the "Cache-Control" header (see below). I recommend to use only add_header as you appreciate the "no-transform" directive of the "Cache-Control" header.
expires 1M;
--> Will set header "Cache-Control" and "Expires".
See documentation:
add_header Cache-Control "public, no-transform, max-age=2628000";
--> Will manually set the "Cache-Control" header.