No React build is being served from this process. That is expected when the backend is deployed on its own.
/api/docs/api/ and /api/pingSplit (usual): clone the frontend repo, then
npm install && npm run dev. It serves on port 3000 and
proxies /api to this backend — set
VITE_API_BASE_URL in frontend/.env if this backend
is not on http://localhost:8000.
Single origin: build the frontend and place the output at
/app/frontend/dist/index.html, then restart this process.