class Puma::Server

def lowlevel_error(e, env)
  if handler = @options[:lowlevel_error_handler]
    if handler.arity == 1
      return handler.call(e)
    else
      return handler.call(e, env)
    end
  end
  if @leak_stack_on_error
    [500, {}, ["Puma caught this error: #{e.message} (#{e.class})\n#{e.backtrace.join("\n")}"]]
  else
    [500, {}, ["An unhandled lowlevel error occurred. The application logs may have details.\n"]]
  end
end