Imports github.com/dchest/captcha github.com/gomodule/redigo/redis github.com/julienschmidt/httprouter github.com/lib/pq github.com/ulule/limiter github.com/ulule/limiter/drivers/middleware/stdlib github.com/ulule/limiter/drivers/store/memory Standard library imports encoding/json html/template log net/http net/url os os/signal strconv strings syscall time