code: 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
  	})
  }
docs: // FromMultiple combines multiple extractors by chaining.