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From: Eric Wong <e@80x24.org>
To: Michael Fischer <mfischer@zendesk.com>
Cc: unicorn-public <unicorn-public@bogomips.org>
Subject: Re: nginx reverse proxy getting ECONNRESET
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Another likely explanation might be you're not draining rack.input every
request, since unicorn does lazy reads off the socket to prevent
rejected uploads from wasting disk I/O[1]

So you can send a bigger POST request with my example to maybe
reproduce the issue.

[1] you can use the Unicorn::PrereadInput middleware to forcibly
    disable the lazy read:
    http://unicorn.bogomips.org/Unicorn/PrereadInput.html