---
title: obj.proto
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/cache-object/obj-proto
---

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

**Available in:** hit, error

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

Access within the `vcl_hit` subroutine is read-only.