server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Use Docker's internal DNS resolver with short cache
    resolver 127.0.0.11 valid=10s ipv6=off;

    # SPA routing
    location / {
        try_files $uri $uri/ /index.html;
    }

    # API proxy to gateway
    location /api/v1/ {
        set $upstream_gateway gateway;
        proxy_pass http://$upstream_gateway:8088;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # Effect RPC WebSocket proxy
    location /api/v1/rpc {
        set $upstream_gateway gateway;
        proxy_pass http://$upstream_gateway:8088;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_read_timeout 86400;
    }

    # Browser OTLP proxy (client posts /otel/v1/*, collector listens on 4318)
    location /otel/ {
        set $upstream_otel otel-collector;
        rewrite ^/otel/(.*)$ /$1 break;
        proxy_pass http://$upstream_otel:4318;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}