edge-nginx.conf

events {}
worker_processes auto;

http {
    # Cache settings
    proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=edge_cache:100m max_size=5g inactive=1h use_temp_path=off;

    upstream main_server {
        server host.docker.internal:8080;  # Main server
    }

    server {
        listen 80;

        # Health check (bypass caching)
        location /health {
            proxy_pass http://main_server;
            proxy_no_cache 1;
            proxy_cache_bypass 1;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        # Default cached route
        location / {
            proxy_cache edge_cache;
            proxy_cache_key "$scheme$request_method$host$request_uri?$args";
            proxy_cache_valid 200 1h;          # Cache successful responses for 1 hour
            proxy_cache_valid 404 5m;         # Cache 404 responses for 5 minutes
            proxy_cache_use_stale error timeout invalid_header http_500 http_502 http_503 http_504 updating;
            proxy_cache_revalidate on;        # Validate cache entries before reusing

            proxy_pass http://main_server;

            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

            add_header X-Cache-Status $upstream_cache_status;

            # Buffering and timeout settings
            proxy_buffer_size 128k;
            proxy_buffers 4 256k;
            proxy_busy_buffers_size 256k;
            proxy_connect_timeout 5s;
            proxy_read_timeout 60s;
            proxy_send_timeout 60s;

            # Ignore backend headers that prevent caching
            proxy_ignore_headers Cache-Control Expires;
        }

        # Access log with cache status for monitoring
        # log_format cache_status '$remote_addr - $host [$time_local] '
        #                         '"$request" $status $body_bytes_sent '
        #                         '"$http_referer" "$http_user_agent" '
        #                         'Cache: $upstream_cache_status';

        # access_log /var/log/nginx/access.log cache_status;
    }
}