---
title: segmented_caching.is_outer_req
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/segmented-caching/segmented-caching-is-outer-req
---

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

**Available in:** log

Whether VCL is running in the context of a request that is assembling file 
segments into a response.

A request for which `vcl_recv` enabled segmented caching (by setting 
`req.enable_segmented_caching` to `true`) will spawn one or more subrequests, 
each responsible for a segment of the file. After the sequence of subrequests 
has completed (each running `vcl_log` with `segmented_caching.is_inner_req` 
evaluating to `true`), `vcl_log` will run with 
`segmented_caching.is_outer_req` evaluating to `true`.

This is useful for controlling what to log. `segmented_caching.is_inner_req` 
and `segmented_caching.is_outer_req` will never be `true` at the same time. 
They will both be `false` when segmented caching is not enabled.