nginx.conf

server {
        listen 80 default_server;
        listen [::]:80 default_server;
        server_name readium.balashan.dev;

        location / {
            try_files $uri $uri/ =404;
        }

}
server {
    server_name readium.balashan.dev www.readium.balashan.dev;

    location / {
        proxy_pass http://localhost:3000;
        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_cache_bypass $http_upgrade;
        gzip on;
        gzip_comp_level 4;
        gzip_types text/plain application/xml application/json application/javascript;
        # Important for Next.js routing
        try_files $uri $uri/ /_next/static/index.html;

        # Logs for frontend
        error_log /var/log/nginx/readium-web_error.log;
        access_log /var/log/nginx/readium-web_access.log;
    }

    location ^~ /_next/static/ {
        root /home/ubuntu/projects/myapp/frontend/readium/playground/.next;
        proxy_pass http://localhost:3000;
        expires 1y;
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    location / {
        proxy_pass http://localhost:15080; # Go app's port
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        try_files $uri $uri/ =404;

        # Logs for backend - go app
        error_log /var/log/nginx/go-toolkit_error.log;
        access_log /var/log/nginx/go-toolkit_access.log;
    }

    listen [::]:443 ssl; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/readium.balashan.dev/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/readium.balashan.dev/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer-when-downgrade" always;
    add_header Content-Security-Policy "default-src 'self' http: https: data: blob: 'unsafe-inline' 'unsafe-eval'" always;

    # Maximum upload size
    client_max_body_size 100M;

    # Buffer size settings
    proxy_buffer_size 128k;
    proxy_buffers 4 256k;
    proxy_busy_buffers_size 256k;

}

server {
    if ($host = readium.balashan.dev) {
        return 301 https://$host$request_uri;
    }

}