reverse_proxy_rack

reverse_proxy_rack.rb

require 'rack/handler/thin'
require 'rack/reverse_proxy'
require 'pathname'

cert = Pathname(__dir__).join('ssl/server.crt').to_s
pkey = Pathname(__dir__).join('ssl/server.key').to_s

app = Rack::Builder.app do
  use Rack::ReverseProxy do
    reverse_proxy_options preserve_host: true, verify_peer: OpenSSL::SSL::VERIFY_NONE
    reverse_proxy '/', 'http://127.0.0.1:9999/'
  end

  run lambda { |env| [ 200, {'Content-Type' => 'text/plain'}, "y hallo thar" ] }
end

Rack::Handler::Thin.run(app, {
  Port: 443,
  Host: '0.0.0.0'
}) do |server|
  server.ssl = true
  server.ssl_options = {
    cert_chain_file: cert,
    private_key_file: pkey,
    verify_peer: false
  }
end

sudo ruby reverse_proxy_rack.rb or rvmsudo ruby reverse_proxy_rack.rb.