---
title: July 2020 VCL release
summary: null
url: https://www.fastly.com/documentation/reference/changes/2020/07/vcl-changes
---

Today the minimum version of VCL available across our network increased, unlocking the following changes:

## New variables

- `resp.stale`
- `resp.stale.is_error`
- `resp.stale.is_revalidating`

These variables all relate to the concept of [staleness and revalidation](https://www.fastly.com/documentation/guides/concepts/edge-state/cache/stale/). They are intended to help developers get a better understanding of the state of stale content, which can help with performance monitoring and observability in general.