discourse/app/views/exceptions/not_found.html.erb

<% local_domain = "#{request.protocol}#{request.host_with_port}" %>

<p>The page you requested doesn't exist on this discussion forum. Perhaps we can help find it, or another topic like it:</p>
<table>
    <tr>
      <td style="vertical-align:top; padding:0 20px 20px 0;">
        <h2>Popular topics</h2>
        <% @popular.each do |t| %>
          <a href='<%= t.relative_url %>'><%= t.title %></a><br/>
        <% end %>
        <br/>
        <a href="/popular" class="btn">See More&hellip;</a>
    </td>
      <td style="vertical-align:top; padding:0 0 20px 0;">
        <h2>Recent topics</h2>
        <% @recent.each do |t| %>
          <a href='<%= t.relative_url %>'><%= t.title %></a><br/>
        <% end %>
        <br/>
        <a href="/popular" class="btn">See More&hellip;</a>
    </td>
    </tr>
</table>
<h2>Search for this topic</h2>
<p>
    <form action='http://google.com'>
    <input type="text" name='q' value="site:<%= local_domain %> <%= @slug %>">
    <!--<input type="button" class="btn" value="Search Here" onclick="alert('single page search results not implemented yet');" />-->
    <input type="submit" class="btn btn-primary" value="Search Google" />
    </form>
</p>