---
title: tls.client.protocol
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/tls-client-protocol
---

**Type:** STRING  
**Access:** read-only

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

The TLS protocol version this connection is speaking over. Example: `"TLSv1.2"`

The `tls.client.protocol` variable will be _not set_ if the connection wasn't 
established over TLS.