actionpack/lib/action_dispatch/middleware/templates/rescues/missing_template.html.erb
<header role="banner">
<h1>Template is missing</h1>
</header>
<main role="main" id="container">
<h2><%= h @exception_wrapper.message %></h2>
<%= render "rescues/source", source_extracts: @source_extracts, show_source_idx: @show_source_idx %>
<%= render "rescues/trace", traces: @traces, trace_to_show: @trace_to_show %>
<%= render template: "rescues/_request_and_response" %>
</main>