class ActionDispatch::DebugExceptions

def call(env)
  request = ActionDispatch::Request.new env
  _, headers, body = response = @app.call(env)
  if headers["X-Cascade"] == "pass"
    body.close if body.respond_to?(:close)
    raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}"
  end
  response
rescue Exception => exception
  invoke_interceptors(request, exception)
  raise exception unless request.show_exceptions?
  render_exception(request, exception)
end