---
title: Retry image-optimization requests on origin failure
summary: If primary backend fails, requests with IO enabled require some special handling.
url: https://www.fastly.com/documentation/solutions/examples/io-failover-retry
---

If primary backend fails, requests with IO enabled require some special handling.

## VCL

[Try it in Fastly Fiddle](https://fiddle.fastly.dev/cd724b3d)