code: @Override
    public EventStream doStreamRequest(final StitchRequest stitchReq) {
      initAppMetadata(clientAppId);
  
      return super.doStreamRequestUrl(stitchReq, getHostname());
    }
docs: Performs a streaming request against a Stitch app server determined by the deployment model
  of the underlying app. Throws a Stitch specific exception if the request fails.
  
  @param stitchReq the request to perform.
  @return an {@link EventStream} that will provide response events.