Imports github.com/ReneKroon/ttlcache github.com/go-redis/redis github.com/gorilla/mux github.com/prometheus/client_golang/prometheus github.com/prometheus/client_golang/prometheus/promauto github.com/prometheus/client_golang/prometheus/promhttp Standard library imports context encoding/json errors fmt image io io/ioutil log net/http os path path/filepath regexp strconv strings time