code: func ContextWithRequestID(ctx context.Context) (context.Context, string) {
  	reqID := ContextRequestID(ctx)
  	if reqID == "" {
  		reqID = shortID()
  		ctx = context.WithValue(ctx, reqIDKey, reqID)
  	}
  	return ctx, reqID
  }
docs: // ContextWithRequestID returns ctx and the request ID if it already has one or creates and returns a new context with
  // a new request ID.