I think Heroku's default Rails app server is WEBRick: https://devcenter.heroku.c... | Hacker News

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igul222 on July 31, 2013 | parent | context | favorite | on: Servers of Hacker News

I think Heroku's default Rails app server is WEBRick: https://devcenter.heroku.com/articles/ruby#webserver

hayksaakian on July 31, 2013 [–]

im pretty sure it's thin

matthewrudy on July 31, 2013 | [–]

It will run thin if the gem is installed. Otherwise it falls back to Webrick. Rack itself favours thin, puma, and webrick (in that order). https://github.com/rack/rack/blob/6829a8a0f416ea49a18f1e3e53...

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