Nginx: Can't set Cache-Control header max-age to 0

[michaelb]

I'm still pretty new to Vesta and having been battling with a caching issue for the last few days:

I'm hosting a PWA and the service worker file must not be cached. I'm using Apache and Nginx as reverse proxy. Server is running Ubuntu 18.04 and using the latest VestaCP

I've set up the domain to use custom templates based on the default templates and including the following:

../templates/web/apache2/pwa.stpl and ../templates/web/apache2/pwa.tpl

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<Files "service-worker.js">
    FileETag None
    Header unset ETag
    Header set Cache-Control "max-age=0, no-store, must-revalidate"
    Header set Pragma "no-cache"
    Header set expires "Wed, 11 Jan 1984 05:00:00 GMT"
</Files>

and ../templates/web/nginx/pwa.stpl and ../templates/web/nginx/pwa.tpl

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location service-worker.js {
    add_header 'Cache-Control' 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
    expires off;
    proxy_no_cache 1;
}

but when I view the headers on the service worker file, it still reads:

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Accept-Ranges: bytes
Cache-Control: max-age=315360000                          <-------
Connection: keep-alive
Content-Length: 964
Content-Type: application/javascript
Date: Sat, 29 Sep 2018 09:34:03 GMT
ETag: "5baf10c0-3c4"
Expires: Thu, 31 Dec 2037 23:55:55 GMT                   <--------
Last-Modified: Sat, 29 Sep 2018 05:42:24 GMT
Server: nginx

Would appreciate any ideas - thanks

[michaelb]

Making some progress:

The file that needs to be edited is /home/myuser/conf/web/mydomain.nginx.ssl.conf and the location snippet relating to the service-worker.js file must go ABOVE the more general location clause (and must include the root value or else it will result in a 404) as follows:

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location / {
        proxy_pass      https://x.x.x.x:8443;
        location ~ (index.html|service-worker.js)$ {
            root           /home/myuser/web/mydomain/public_html;
            add_header Cache-Control 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
	    expires off;
	}
	location ~* ^.+\.(jpg|jpeg|gif|png|ico|svg|css|zip|tgz|gz|rar|bz2|exe|pdf|doc|xls|ppt|txt|odt|ods|odp|odf|tar|bmp|rtf|js|mp3|avi|mpeg|flv|html|htm)$ {
            root           /home/myuser/web/mydomain/public_html;
            access_log     /var/log/apache2/domains/mydomain.log combined;
            access_log     /var/log/apache2/domains/mydomain.bytes bytes;
	    expires        max;
            try_files      $uri @fallback;
        }
    }