This is a RESTful Web Service built by Spring Boot framework with Redis database and HyperLogLog algorithm to count daily and monthly Unique Visitors (UV).
mvn spring-boot:runGET /collect?cid=<UUID>: response is 200 OK with an empty body.
GET /daily_uniques?d=<ISO 8601 date>: return the number of unique users seen for the given GMT day.
GET /monthly_uniques?d=<ISO 8601 date>: return the number of unique users seen in the month prior to and including the given GMT day.
GET http://localhost:8080/collect?cid=new
GET http://localhost:8080/daily_uniques?d=2021-04-21
GET http://localhost:8080/monthly_uniques?d=2021-04-21