How to test:

• Add in /etc/hosts:

127.0.0.1 firstdomain.dev
127.0.0.1 seconddomain.dev
127.0.0.1 server.dev

• Inside client folder, run this command: ruby -run -e httpd . -p 8000;
• Inside server folder, run this command: ruby app.rb
• Open browser and go to: http://firstdomain.dev:8000/
• Open in another tab browser the url: http://seconddomain.dev:8000/

Check if the same Cookie ID was displayed.