Need five terminal tabs with working directory as current directory:

• php -S localhost:7000 -t example/ - for client
• php -S localhost:7001 -t example/ - for target website
• php -S localhost:7002 -t example/ - for dispatcher
• php -S localhost:7010 -t example/ - for endpoint 1
• php -S localhost:7020 -t example/ - for endpoint 2

after setting up, open http://localhost:7000/client.php in webbrowser and check if "All tests passed"

Addresses are hardcoded in example/config.php, also you can set proxy here setProxyAddress() to better see requests

Here is one-liner for one terminal:

php -S localhost:7000 -t example/ & \
php -S localhost:7001 -t example/ & \
php -S localhost:7002 -t example/ & \
php -S localhost:7010 -t example/ & \
php -S localhost:7020 -t example/ & \
sleep 4 && curl http://localhost:7000/client.php