Configure Nginx as a Reverse Proxy on AlmaLinux 9

Basic reverse proxy

upstream backend {
    server 127.0.0.1:3000;
}

server {
    listen 80;
    server_name app.example.com;
    location / {
        proxy_pass         http://backend;
        proxy_http_version 1.1;
        proxy_set_header   Upgrade          $http_upgrade;
        proxy_set_header   Connection       "upgrade";
        proxy_set_header   Host             $host;
        proxy_set_header   X-Real-IP        $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Proto $scheme;
        proxy_read_timeout 86400;
    }
}

Tuning

proxy_buffering         on;
proxy_buffer_size       16k;
proxy_buffers           4 16k;
proxy_connect_timeout   60s;
proxy_send_timeout      60s;
proxy_read_timeout      60s;

Reload

nginx -t && systemctl reload nginx 2>/dev/null || nginx -t && rcctl reload nginx