---
title: quic.cc.cwnd
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/quic-cc-cwnd
---

**Type:** INTEGER  
**Access:** read-only

**Available in:** recv, hash, deliver, log

The current value of the congestion window, for the current congestion control
algorithm. For Reno, see [draft-ietf-quic-recovery](https://tools.ietf.org/html/draft-ietf-quic-recovery) for more details.