Chapter looks unfinished since get() and getAll() methods require extra cb callback parameter

This chapter leaves coffeerun project in non-functional state, by that it adds additional
requirement to same named functions of DataStore* class/prototype family:
get() and getAll() methods now require extra cb callback parameter
rds = new RemoteDataStore(SERVER_URL);
rds.get(key,cb) and rds.getAll(cb);
instead of former
ds.get(key) and ds.getAll();

can’t get the contents of RemoteDataStore using web-interface, because of this.
Hope the next/last for this project chapter will correct this, but any way this is the first unfinished chapter in this book…

Any advice how to make get/getAll make work here?