code: func (h *portForwardProxy) getStreamPair(requestID string) (*httpStreamPair, bool) {
  	h.streamPairsLock.Lock()
  	defer h.streamPairsLock.Unlock()
  
  	if p, ok := h.streamPairs[requestID]; ok {
  		log.Infof("(conn=%p, request=%s) found existing stream pair", h.sourceConn, requestID)
  		return p, false
  	}
  
  	log.Infof("(conn=%p, request=%s) creating new stream pair", h.sourceConn, requestID)
  
  	p := newPortForwardPair(requestID)
  	h.streamPairs[requestID] = p
  
  	return p, true
  }
docs: // getStreamPair returns a httpStreamPair for requestID. This creates a
  // new pair if one does not yet exist for the requestID. The returned bool is
  // true if the pair was created.