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Heroku's message: "If you have slow clients you are screwed" Unicorn is designed to only serve fast clients on low-latency.

And no, they don't do any buffering.

I think that overstates it a bit, but yes, there are problems with Unicorn and slow clients. We're investigating: https://blog.heroku.com/archives/2013/4/3/routing_and_web_pe...

If this is an immediate problem for you, it might be worth your while to make your app threadsafe, which gives you more concurrent webserver options.

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