nginx

nginx as a web server or as a reverse proxy in front of Apache, as usual with Plesk: test the configuration, reload it, check redirects and headers.

12 one-liners: 11 harmless, 1 caution, 0 destructive

nginx 8 curl 4 configuration 4 performance 3 plesk 3 headers 2 proxy 2

Check the browser caching headers of a file

$curl -sI https://example.com/wp-includes/css/dist/block-library/style.min.css | grep -iE "^(cache-control|expires|etag|last-modified|age):"

Check the nginx configuration for syntax errors

Check whether a website serves gzip or Brotli

$curl -s -o /dev/null -D - -H "Accept-Encoding: br, gzip" https://example.com/ | grep -i "^content-encoding"

Check whether a website supports HTTP/2

$curl -sI --http2 https://example.com/ | head -1

Check whether nginx is enabled in Plesk

#plesk sbin nginxmng --status

Detect the web server and PHP version from HTTP headers

$curl -sI https://example.com/ | grep -iE "^(server|x-powered-by|via):"

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Find the cause of a 502 Bad Gateway in the nginx log

#grep -E "upstream|connect\(\) failed" /var/log/nginx/error.log | tail -20

Show all nginx server_name entries with their config file

#nginx -T 2>/dev/null | grep -E "^# configuration file|server_name "

Show the additional nginx directives of a Plesk domain

#cat /var/www/vhosts/system/example.com/conf/vhost_nginx.conf

Show the nginx configuration Plesk generated for a domain

#cat /var/www/vhosts/system/example.com/conf/nginx.conf

Show the nginx version and compiled-in modules

$nginx -V 2>&1 | tr " " "\n" | grep -E "version|_module"

Test the nginx configuration and reload only on success

#nginx -t && systemctl reload nginx