code: func (service *Service) Logout(w http.ResponseWriter, request *http.Request) {
  	service.SetLoggedInUser(w, request, "")
  	sessions.Save(request, w)
  	http.Redirect(w, request, "", http.StatusFound)
  }
docs: //Logout logs out the user and redirect to the homepage
  //TODO: csrf protection, really important here!