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I assume that this is the same cowboy server that provides the Heroku routing layer. Does this mean anything for our Heroku apps?

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As far as I've seen, it used to be a heavily modified version of cowboy v1 [1]. I'm not sure what they're using now.

[1]: https://github.com/heroku/cowboyku

HTTP headers still say "Server: Cowboy" and "Via: 1.1 vegur", so vegur+cowboyku+custom code.

Don't worry, heroku can barely manage to deploy docker containers into their specialized stack (try it, it's fun and massively disappointing if you have a worker process). This won't affect your heroku apps because they'll basically never be able to upgrade their routing layer. Evidence: their routing layer is already horrendously broken and has been since 2012.

Hhehe

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