Optionalhandler: OAuth2PasswordTokenHandler<P, ResBody, ReqBody, ReqQuery, Locals, MetaResType>Optionalhandler: OAuth2BadRequestHandler<P, ResBody, ReqBody, ReqQuery, Locals, MetaResType>Optionalhandler: OAuth2PasswordTokenHandler<P, ResBody, ReqBody, ReqQuery, Locals, MetaResType>