Hi, I have simple function for logout that looks like this

public logoutHandler() {
    fetch('/logout', <RequestInit>{
      method: 'get',
      credentials: 'include'
    }).then((response) => {
      console.log(document.cookie);
      window.location.href = '/login';
    });
  }

It is workin in chrome but in firefox I get "TypeError: NetworkError when attempting to fetch resource.1 (unknown)". Client side app is on the same server as backend, I'm using https connection with self-signed cert, could it be the issue?