Root
GET /chat/rest/?format=api
http://em-guitar.iism.kit.edu/chat/rest/rooms", "whoami": "http://em-guitar.iism.kit.edu/chat/rest/whoami" }{ "rooms": "
GET /chat/rest/?format=api
http://em-guitar.iism.kit.edu/chat/rest/rooms", "whoami": "http://em-guitar.iism.kit.edu/chat/rest/whoami" }{ "rooms": "