Path to DebugBar get to the Preview controller

[mayeco]

I use DebugBar and by websocket the path get detected by the preview controller.

ws://127.0.0.1:3000/_debugbar/cable

I have to fixed by a monkeypatch:

module Maglev
  class PreviewConstraint
    def matches?(request)
      request.headers["HTTP_UPGRADE"] != "websocket" && (accepted_format?(request) || crawler?(request)) && match_host?(request)
    end
  end
end

@did do you think we should add that to the PreviewConstraint? any site using socket inside maglev?

[did]

Thanks for providing the fix! no problem to accept a PR fixing this problem. thanks!