*
     * [alt_svc]: http://tools.ietf.org/html/draft-ietf-httpbis-alt-svc-01
     *
     * @param streamId when a client-initiated stream ID (odd number), the origin of this alternate
     *     service is the origin of the stream. When zero, the origin is specified in the `origin`
     *     parameter.
     * @param origin when present, the [origin](http://tools.ietf.org/html/rfc6454) is typically