Why might the browser cache not work through nginx?

Question

Nginx

For some reason, the HTTP response does not contain the expiration date of static resources, namely the ".gif" and ".jpg" files.
".png" works:

Cache-Control:max-age=604800
Cache-Control:public
Connection:keep-alive
Date:Thu, 13 Aug 2015 11:04:55 GMT
ETag:"55c8b874-1cd0"
Expires:Thu, 20 Aug 2015 11:04:55 GMT
Last-Modified:Mon, 10 Aug 2015 14:43:00 GMT
Pragma:public
Server:nginx/1.4.6 (Ubuntu)

Maybe something in the nginx config is wrong:

server {
        location ~ \.php$ {
                try_files $uri =404;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                include fastcgi_params;
       }

        location ~* \/\.ht {
                deny all;
        }
        location ~* ^\/(classes|errors\/logs|sys\-temp|cache|xmldb|static|packages) {
                deny all;
        }
        location ~* (\/for_del_connector\.php|\.ini|\.conf)$ {
                deny all;
        }
        location ~* ^(\/files\/|\/images\/) {
                try_files $uri =404;
        }
        location ~* ^\/images\/autothumbs\/ {
                try_files $uri @autothumbs =404;
        }
        location @autothumbs {
                rewrite ^\/images\/autothumbs\/(.*)$ /autothumbs.php?img=$1$query_string last;
        }
        location @clean_url {
                rewrite ^/(.*)$ /index.php?path=$1 last;
        }
        location @dynamic {
                try_files $uri @clean_url;
        }
             location / {
                rewrite ^\/robots\.txt /sbots.php?path=$1 last;
                rewrite ^\/sitemap\.xml /sitemap.php last;
                rewrite ^\/\~\/([0-9]+)$ /tinyurl.php?id=$1 last;
                rewrite ^\/(udata|upage|uobject|ufs|usel|ulang|utype|umess|uhttp):?(\/\/)?(.*)? /releaseStreams.php?scheme=$1&path=$3 last;
                rewrite ^\/(.*)\.xml$ /index.php?xmlMode=force&path=$1 last;
                rewrite ^(.*)\.json$ /index.php?jsonMode=force&path=$1 last;
                if ($cookie_umicms_session) {
                        error_page 412 = @dynamic;
                        return 412;
                }
                if ($request_method = 'POST') {
                        error_page 412 = @dynamic;
                        return 412;
                }
        }
        location ~* \.js$ {
                rewrite ^\/(udata|upage|uobject|ufs|usel|ulang|utype|umess|uhttp):?(\/\/)?(.*)? /releaseStreams.php?scheme=$1&path=$3 last;
                try_files $uri =404;
        }
        location ~* \.(ico|jpg|jpeg|png|gif|swf|css)$ {
                access_log off;
                expires 7d;
                add_header Pragma public;
                add_header Cache-Control "public";
                try_files $uri =404;

        }
}

CMS: UMI.

Answer 1

Arik was right.
Removed "\/images\/" from

location ~* ^(\/files\/|\/images\/) {
                try_files $uri =404;
        }

and everything worked.

Answer 2

Do the files in the same folder really exist? just two locations at the same time, I can’t seem to work out

Answer 3

location ~* ^.+\.(jpg|jpeg|gif|png|ico|css|pdf|ppt|txt|bmp|rtf|js)$ {
        root /path_to_root/;
        access_log off;
        expires 7d;
        }