---
title: beresp.do_stream
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/backend-response/beresp-do-stream
---

**Type:** BOOL  
**Access:** can be read and set, but not unset

**Available in:** fetch

Whether or not streaming miss is enabled for the request. If enabled, Varnish 
will send the response from the origin to the clients as it is received 
from origin instead of buffering the entire response first. This can 
substantially increase the performance of cache misses on large objects.