$ git clone https://github.com/xiuqingli/gan.git
$ cd gan
$ npm install
$ node .
a) GET http://localhost:3000/group
b) GET http://localhost:3000/employee
c) GET http://localhost:3000/employee/name/Casper
d) POST http://localhost:3000/employee {"name" : "Jose", "id" : "7788"}