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Since the Unicorn documentation explicitly states that you should not let it handle slow clients (everything outside your datacenter) directly, using Rainbows![1] might be a better solution.

[1] http://rainbows.rubyforge.org/

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Heroku apps at the very least sit behind the heroku router, which I would assume is in the same datacenter. If the information in this quora answer http://www.quora.com/Scalability/How-does-Heroku-work is still valid, your app is also behind a front-facing nginx reverse-proxy.

I'm not sure that actually means it's handling slow-clients, though.

I think the important part is that the reverse-proxy should buffer the request, but I can't find anything about wether or not the Heroku router does this.

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