launch thin server by hand mounting Sinatra app

gistfile1.rb

require 'bundler/setup'
require 'sinatra/base'
require 'thin'
require 'eventmachine'

class MyApp < Sinatra::Base
  get '/hi' do
    response[:content_type] = 'text/plain'
    'hi'
  end
end

server = ::Thin::Server.new('0.0.0.0', 8080, MyApp)
trap('INT') { EM.stop }

EM.run do
  server.start
end