code: func FromParams(r *http.Request) (*jwt.JSONWebToken, error) {
  	if r == nil {
  		return nil, ErrNilRequest
  	}
  	raw := r.URL.Query().Get("token")
  	if raw == "" {
  		return nil, ErrTokenNotFound
  	}
  	return jwt.ParseSigned(raw)
  }
docs: // FromParams returns the JWT when passed as the URL query param "token".