actionpack/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb
<header role="banner">
<h1>
<%= @exception_wrapper.exception_name %> in
<%= @request.parameters["controller"].camelize if @request.parameters["controller"] %>#<%= @request.parameters["action"] %>
</h1>
</header>
<main role="main" id="container">
<p>
Showing <i><%= @exception_wrapper.file_name %></i> where line <b>#<%= @exception_wrapper.line_number %></b> raised:
</p>
<pre><code><%= h @exception_wrapper.message %></code></pre>
<%= render "rescues/source", source_extracts: @source_extracts, show_source_idx: @show_source_idx %>
<p><%= @exception_wrapper.sub_template_message %></p>
<%= render "rescues/trace", traces: @traces, trace_to_show: @trace_to_show %>
<%= render template: "rescues/_request_and_response" %>
</main>