app/views/sessions/new.html.erb
<%= form_tag('/auth/developer/callback', method: 'post', data: { turbo: false }) do %>
<%= hidden_field_tag :authenticity_token, session[:_csrf_token] %>
<%= text_field_tag :name %>
<%= text_field_tag :email %>
<button type='submit'>Login with Developer</button>
<% end %>