People like @rskang like their privacy and strip out HTTP_REFERER headers. When we render the form we have everything we need to provide the correct state to the controller:

```erb
<%= form_tag(opt_out_index_path) do %>
  <%= hidden_tag(:return_to, request.original_url %>
  <%= button_tag(t('opt_out.button'), class: 'opt-out-bar__button icon--desktop') %>
<% end %>
```