func FromMultiple(extractors ...RequestTokenExtractor) RequestTokenExtractor {
	return RequestTokenExtractorFunc(func(r *http.Request) (*jwt.JSONWebToken, error) {
		for _, e := range extractors {
			token, err := e.Extract(r)
			if err == ErrTokenNotFound {
				continue
			} else if err != nil {
				return nil, err
			}
			return token, nil
		}
		return nil, ErrTokenNotFound
	})
}
func FromMultiple(extractors ...RequestTokenExtractor) RequestTokenExtractor {
	return RequestTokenExtractorFunc(func(r *http.Request) (*jwt.JSONWebToken, error) {
		for _, e := range extractors {
			token, err := e.Extract(r)
			if err == ErrTokenNotFound {
				continue
			} else if err != nil {
				return nil, err
			}
			return token, nil
		}
		return nil, ErrTokenNotFound
	})
}
// FromMultiple combines multiple extractors by chaining.