server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # API calls go to the Go service over the compose network. Because the
    # browser reaches both the app and /api on the same origin (localhost:4200),
    # there is no CORS to configure.
    location /api/ {
        proxy_pass         http://api:8080;
        proxy_http_version 1.1;
        proxy_set_header   Host $host;
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        # Pass through the auth and tenant headers the SPA sends.
        proxy_pass_request_headers on;
    }

    # Angular is a single-page app: unknown paths fall back to index.html so
    # client-side routing works on reload / deep link.
    location / {
        try_files $uri $uri/ /index.html;
    }
}