This page is being served by Ruby 0.49, the oldest surviving version of Ruby, released by Yukihiro matz Matsumoto on 18 July 1994.
sinatra049 is a small Sinatra-style web framework built entirely within the constraints of this 30-year-old language. No modern Ruby, no C extensions, no cheating. Just TCPserver.open(), classes with : inheritance, and apply() for dispatch.
Hello Matz | Hello World | User 42 | User 1994 | About
sinatra049 on GitHub (framework source)
sampersand/ruby-0.49 (source, examples, syntax reference)
ancient_ruby gem (portable Ruby 0.49 binary)
To matz for creating Ruby in 1993 and sharing it with the world. And to sampersand for preserving Ruby 0.49 and documenting its quirks.