don't hide error messages
don't hide error messages

If connection is refused, `error: RESTEASY004655: Unable to invoke request`
is shown but it should also show `Connection refused`.

treasure-data/digdag,treasure-data/digdag,treasure-data/digdag,KimuraTakaumi/digdag,KimuraTakaumi/digdag,treasure-data/digdag,KimuraTakaumi/digdag,treasure-data/digdag,KimuraTakaumi/digdag,KimuraTakaumi/digdag,treasure-data/digdag,treasure-data/digdag,KimuraTakaumi/digdag