---
title: req.proto
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-request/req-proto
---

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

**Available in:** all subroutines

HTTP protocol version in use for this request. For example `HTTP/1.1`.

> **IMPORTANT:** Use of the data exposed by this variable could, in some cases, introduce [ossification risk](https://www.fastly.com/blog/minimizing-ossification-risk-is-everyones-responsibility) to the internet.