Updated version of an article first published on February 10th, 2017. The Ruby app server ecosystem has consolidated around three app servers: Unicorn, Puma, and Passenger 5. What specific problems must an app server solve for Ruby? How do you pick the right app server? Is there a need for each of these app servers in 2021? In this post, we'll cover all of the above, as well as compare and contras
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