class RDoc::Servlet

def error exception, req, res
  backtrace = exception.backtrace.join "\n"
  res.content_type = 'text/html'
  res.status = 500
  res.body = <<-BODY
DOCTYPE html>
tml>
ead>
eta content="text/html; charset=UTF-8" http-equiv="Content-Type">
itle>Error - #{ERB::Util.html_escape exception.class}</title>
ink type="text/css" media="screen" href="#{@mount_path}/css/rdoc.css" rel="stylesheet">
head>
ody>
1>Error</h1>
>While processing <code>#{ERB::Util.html_escape req.request_uri}</code> the
oc (#{ERB::Util.html_escape RDoc::VERSION}) server has encountered a
ode>#{ERB::Util.html_escape exception.class}</code>
ception:
re>#{ERB::Util.html_escape exception.message}</pre>
>Please report this to the
 href="https://github.com/ruby/rdoc/issues">RDoc issues tracker</a>.  Please
clude the RDoc version, the URI above and exception class, message and
cktrace.  If you're viewing a gem's documentation, include the gem name and
rsion.  If you're viewing Ruby's documentation, include the version of ruby.
>Backtrace:
re>#{ERB::Util.html_escape backtrace}</pre>
body>
html>
  BODY
end