---
title: Use A/B testing to personalize responses
summary: Serve different responses to separate user cohorts.
url: https://www.fastly.com/documentation/solutions/examples/ab-testing
---

Serve different responses to separate user cohorts.

## VCL

[Try it in Fastly Fiddle](https://fiddle.fastly.dev/bb1c1a6e)

## Compute

### Rust

[Try it in Fastly Fiddle](https://fiddle.fastly.dev/604ea5d5)

### Javascript

[Try it in Fastly Fiddle](https://fiddle.fastly.dev/113f027e)