Simple service to store geolocation (or any other generic user based data) by GET + POST rest service using redis, protected by an APP key.
Saving data
POST /
{"user": "rephus", "latitude":51.5296836,"longitude":-0.080295}
Getting list of users with their latest location
GET /
{"rephus" : {"user": "rephus", "latitude":51.5296836,"longitude":-0.080295} }