Cargo is a car service management system which let car owners make washing service reservation, and allows service providers to manage their business (publish service, remind service) without having to change their original business process.
The system was developed with Tornado and originally deployed on Sina App Engine, so it requires services on the platform to work properly. Also, car owner side web service requires accessment from WeChat (using its authentication service).
The code is just for reference and works as sample code.