Fair point on WebRick.
Unicorn is also a good choice for a Ruby HTTP server, although it doesn't run under JRuby.
Puma I think is particularly interesting as it offers decent performance in both MRI and JRuby - although JRuby is still quicker in that case. (should add the results for Puma under MRI to the site)
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[ 4.7 ms ] story [ 13.9 ms ] threadAnother choice (which we use) is Unicorn[1], though I have become a huge fan of Puma lately.
[1] http://unicorn.bogomips.org/