Run both router repro parallel cd router-repro/tanstack-router && npm run dev cd router-repro/react-router && npm run dev

this will start the two repos in parallel with different ports then you should spin up the backend server to see proxy result

cd backend && npm run dev

go to http://localhost:3000/react-router and http://localhost:3000/tanstack-router and see the result

to see independent results without proxy: http://localhost:3055/react-router http://localhost:3056/tanstack-router

both working but tanstack-router is not working with proxy