Incomplete chunks on Heroku with Dart app - heroku

I enabled WebSockets support on my Heroku application but last week Heroku updated their platform's routing architecture.
Now I get incomplete chunks in my browser. You can try my app:
http://dartlangfr-risk.herokuapp.com
Here my server code:
https://github.com/ggirou/risk/blob/master/bin/main.dart#L16-L40
Does anyone have a clue?
Thanks

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