Electron tries to load the URL with the HTTPS protocol, but what I load is explicitly HTTP. Webpack loads correctly at the HTTP address, so it should be an Electrum problem.
mainWindow.loadURL('http://localhost:8080/index.html'))
[3396:0330/104324.454:ERROR:ssl_client_socket_impl.cc(995)] handshake failed; returned -1, SSL error code 1, net_error -107
[3396:0330/104324.530:ERROR:ssl_client_socket_impl.cc(995)] handshake failed; returned -1, SSL error code 1, net_error -107
(node:6116) electron: Failed to load URL: https://localhost:8080/index.html with error: ERR_SSL_PROTOCOL_ERROR
<i> [webpack-dev-server] Project is running at:
<i> [webpack-dev-server] Loopback: http://localhost:8080/
<i> [webpack-dev-server] On Your Network (IPv4): http://192.168.0.3:8080/
<i> [webpack-dev-server] Content not from webpack is served from 'C:\gestionalefp_client\public' directory
<i> [webpack-dev-server] 404s will fallback to '/index.html'