selenium-webdriver test electron desktop app

I have desktop frontend App built using electron-prebuild and communicating through swagger to backend, and backend server built using using electron-prebuild as well listening on 127.0.0.1:3000, then i manually start backend server and i try to use selenium-webdriver write automation test for frontend, I can start frontend and fill login form but now frontend only send TCP request not http request(monitor local network transaction using RawCap), so I cant get frontend talk to backend, why this happen?