# Serves the API from the same origin as the SPA, replacing the 404 stub the
# image ships. Traefik routes on the Host header, which a bare IP never
# matches, so this is what makes http://<host-ip>:<port> a complete app: the
# client asks for /api/v1/... on whatever origin served it, and never needs a
# resolvable api.${DOMAIN} or a CORS allowance.

location /api {
    # Docker's embedded DNS, re-resolved: nginx otherwise pins the backend's
    # address at startup and 502s for good once that container is recreated.
    resolver 127.0.0.11 valid=10s ipv6=off;
    set $backend_upstream http://backend:8000;
    proxy_pass $backend_upstream$request_uri;

    proxy_http_version 1.1;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    # The flow websocket (/api/v1/flows/ws) upgrades through here; passing the
    # client's own Connection header covers both it and ordinary requests.
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $http_connection;
    # A live socket outlives the 60s default by design.
    proxy_read_timeout 1d;
}

# Unchanged from the stub: the API docs stay off the frontend's origin.
location /docs {
    return 404;
}
location /redoc {
    return 404;
}