F7 core CLI with webpack and request/response to/from server-side script

I’m making a request to a server side script prior to form submission but when I press the submit button nothing happens, even when I log it out on my console, nothing appears, like no feedback…

And do you run required PHP server for that? And also i can’t sure that app served with webpack dev server (localhost) can’t work on same port as PHP server, so local paths request won’t work