nginx.conf

worker_processes auto;

events {
    worker_connections 1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

   # Compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml application/wasm;

    upstream backend {
        server shortenerbackend:5261;
    }

    server {
        listen 80;
        server_name localhost;

        # Caching for static assets
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|wasm)$ {
            root /usr/share/nginx/html;
            expires 30d;
            add_header Cache-Control "public, no-transform";
        }
        
        # Frontend URL Whitelist
        location ~ ^/(Profile|LinkShortener|Dashboard|Login|SignUp|ForgetPassword|Notfound|RedirectURL|Home|Index) {
            root /usr/share/nginx/html;
            index index.html;
            try_files $uri $uri/ /index.html;
        }

        # API routes always go to backend
        location /api {
            proxy_pass http://backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }

        # Resolve route for backend
        location /Resolve {
            proxy_pass http://backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }

        # URL Shortener redirect (last check before generic routes)
        location ~ "^/[a-zA-Z0-9]{1,32}$" {
            proxy_pass http://backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }

        # All other routes default to frontend SPA routing
        location / {
            root /usr/share/nginx/html;
            index index.html;
            try_files $uri $uri/ /index.html;
        }
    }
}