Imports github.com/go-acme/lego/v4/challenge/dns01 github.com/go-acme/lego/v4/log github.com/go-acme/lego/v4/platform/config/env github.com/go-acme/lego/v4/providers/dns/namecheap/internal golang.org/x/net/publicsuffix Standard library imports context errors fmt net/http strconv strings time