---
title: req.is_clustering
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/server/req-is-clustering
---

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

**Available in:** all subroutines

Whether the request was received from another machine in the [cluster](https://www.fastly.com/documentation/guides/vcl/clustering).