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It depends on the webserver you use, not Heroku. The webserver must implement the hijacking API of Rack.

Also, you don't necessarily have to run an HTTP server on Heroku. They'll run whatever you want (as long as you change your procfile), so I think you can just go nuts. I think the only restriction is that you can't have the socket open for more than 30 seconds (though that may be 30 seconds of the socket being idle).

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