Simple pure-ruby standard-library-only HTTP server

run.rb

#!/usr/bin/env ruby
require 'socket'
require 'json'
server = TCPServer.new '0.0.0.0', 8765
loop do
  socket = server.accept
  data = ""
  while (line = socket.gets) && line != "\r\n"
    data += line
  end
  type, path = data.split(/ /)[0..1]
  content_length = data =~ /Content-Length: (\d+)/ ? $1.to_i : 0
  body = socket.read content_length if content_length > 0
  puts ({ type: type, path: path, body: body }).inspect
  respond = -> (code, body, headers = []) {
    names = { 200 => "OK", 404 => "Not Found" }
    socket.puts "HTTP/1.1 #{code} #{names[code]}\r\n"
    headers.each { |k, v| socket.puts "#{k}: #{v}\r\n" }
    socket.puts "Content-Length: #{body.size}\r\n\r\n#{body}"
  }
  handlers = [
    ["GET", /\A\/posts\/\d+\/comments, -> () { respond.call(200,
      [{ title: "asdf", author: "guy blahdude" }].to_json + "\n",
      { "Content-Type" => "application/json" }
    )}]
  ]
  handler = handlers.find { |h| type == h[0] && path =~ h[1] }
  handler ? handler[2].call : respond.call(404, "No idea, man\n")
  socket.close
end