---
title: Reference
description: Reference information for APO, including caching, Page Rules, and query parameters.
image: https://developers.cloudflare.com/core-services-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/automatic-platform-optimization/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# Reference

* [ Query parameters and cached responses ](https://developers.cloudflare.com/automatic-platform-optimization/reference/query-parameters/)
* [ Page Rule integration with APO ](https://developers.cloudflare.com/automatic-platform-optimization/reference/page-rule-integration/)
* [ Cache by device type ](https://developers.cloudflare.com/automatic-platform-optimization/reference/cache-device-type/)
* [ Subdomains and subdirectories ](https://developers.cloudflare.com/automatic-platform-optimization/reference/subdomain-subdirectories/)

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