Nginx image header cache not updating

Question

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$" { }
}

Please show the complete `server` block. – Michael Hampton Mar 20 '18 at 01:08 — Michael Hampton, Mar 20 '18 at 01:08

score 2 · Accepted Answer · answered Mar 20 '18 at 10:03

2

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:

Enables or disables adding or modifying the “Expires” and “Cache-Control” response header ...

add_header Cache-Control "public, no-transform, max-age=2628000";

--> Will manually set the "Cache-Control" header.

answered Mar 20 '18 at 10:03

Jens Bradler

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I tried that, it's not applying to the image. The header never change. – user3108268 Mar 20 '18 at 11:09
Turns out it has something to do with `pagespeed`. But not sure what, toggling it off and on after making changes to my header, it applies. You can see the rest of my config in original post. – user3108268 Mar 20 '18 at 11:30

Nginx image header cache not updating

1 Answers1