---
title: resp.stale.is_revalidating
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/miscellaneous/resp-stale-is-revalidating
---

**Type:** BOOL  
**Access:** read-only

**Available in:** all subroutines

Whether or not the selected response is a stale cache hit due to a background refresh (asynchronous revalidation).

Also see `resp.stale` and `resp.stale.is-error`.