auth/jwt.go
func Extractor(e request.Extractor) TokenOpt {
	return TokenOpt{func(o *options) {
		o.extractor = e
	}}
}
func Extractor(e request.Extractor) TokenOpt {
	return TokenOpt{func(o *options) {
		o.extractor = e
	}}
}
// Extractor extracts a token from a request