actionpack/lib/action_dispatch/middleware/templates/rescues/routing_error.text.erb
Routing Error
<%= @exception.message %>
<% unless @exception.failures.empty? %>
Failure reasons:
<% @exception.failures.each do |route, reason| %>
- <%= route.inspect.delete('\\') %></code> failed because <%= reason.downcase %>
<% end %>
<% end %>
<%= render template: "rescues/_trace", format: :text %>