Update httpServer.go
GOKRB5 Service: 2018/09/11 11:27:23 http.go:57: 192.168.139.137:43856 user@REALM - SPNEGO authentication succeeded
2018/09/11 11:27:23 http: panic serving 1.2.3.4:2345: interface conversion: interface {} is *credentials.Credentials, not credentials.Credentials