Last week I was speaking at the London Erlang Factory Lite where I presented a live demonstration of building an FTP server using Ranch. As there was no slide, you should use this article as a reference instead. The goal of this article is to showcase how to use Ranch for writing a network protocol implementation, how Ranch gets out of the way to let you write the code that matters, and the common techniques used when writing servers.

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Everyone knows Tic Tac Toe, right? Players choose either to be the Xs or the Os, then place their symbol on a 3x3 board one after another, trying to create a line of 3 of them. Writing an algorithm to check for victory sounds easy, right? It's easily tested, considering there's only 8 possible winning rows (3 horizontal, 3 vertical and 2 diagonal). In Erlang though, you probably wouldn't want an algorithm.

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