Gemfile

source 'https://rubygems.org'

gem 'http-2', require: 'http/2'
gem 'reel', github: 'kenichi/reel', branch: 'http2'

reel_http2.rb

#!/usr/bin/env ruby

require 'bundler'
Bundler.require

Reel::Connection::HTTP2.on :stream do |s|

  res = [
    "hi there.",
    "how's it going?",
    "yay!"
  ]

  s[:stream].headers({
    ':status' => '200',
    'content-length' => res.join(nil).bytesize.to_s,
    'content-type' => 'text/plain',
  }, end_stream: false)

  s[:stream].data res[0], end_stream: false
  Celluloid.sleep 3
  s[:stream].data res[1], end_stream: false
  Celluloid.sleep 1
  s[:stream].data res[2]

end

module Reel
  class Server
    class HTTP2S < Server
      def initialize(host, port, options={}, &callback)

        ssl_context               = OpenSSL::SSL::SSLContext.new
        ssl_context.cert          = OpenSSL::X509::Certificate.new options.fetch(:cert)
        ssl_context.key           = OpenSSL::PKey::RSA.new options.fetch(:key)
        ssl_context.npn_protocols = ['h2']
        ssl_context.verify_mode   = OpenSSL::SSL::VERIFY_NONE

        @tcpserver = Celluloid::IO::TCPServer.new(host, port)

        server = Celluloid::IO::SSLServer.new(@tcpserver, ssl_context)
        options.merge!(host: host, port: port)

        options[:rescue] = [ OpenSSL::SSL::SSLError ]
        super(server, options, &callback)
      end
    end
  end
end


class R < Reel::Server::HTTP2S

  def initialize
    puts "listening 127.0.0.1:4567..."
    super '127.0.0.1', 4567, {
      cert: File.read('public.pem'),
      key:  File.read('private.pem')
    }, &method(:on_connection)
  end

  def on_connection connection
    connection.each_request do |request|
      request.respond 200, ''
    end
  end

end

R.run