Fix server.method for Hapi

Note:
https://github.com/hapijs/hapi/blob/6c2d74130bbbb94b19c614860e2948d26f28eb23/lib/methods.js#L17
https://github.com/hapijs/hapi/blob/6c2d74130bbbb94b19c614860e2948d26f28eb23/lib/methods.js#L83