---
description: Methods for customizing cache behavior with rules, Workers, and headers.
title: Customize cache
image: https://developers.cloudflare.com/og-docs.png
---

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# Customize cache

Last updated Aug 25, 2026|Copy as Markdown|[View as Markdown](https://4f1c5cd2.previews.developers.cloudflare.com/cache/concepts/customize-cache/index.md)|[Agent setup](https://4f1c5cd2.previews.developers.cloudflare.com/agent-setup/)

Some possible combinations of origin web server settings and Cloudflare [Cache Rules](https://4f1c5cd2.previews.developers.cloudflare.com/cache/how-to/cache-rules/) include:

## Create a directory for static content at your origin web server

For example, create a `/static/` subdirectory at your origin web server and a Cache Everything Cache Rule matching the following expression:

* Using the Expression Builder: `Hostname contains "example.com" AND URI Path starts with "/static"`
* Using the Expression Editor: `(http.host contains "example.com" and starts_with(http.request.uri.path, "/static"))`

## Append a unique file extension to static pages

For example, create a `.shtml` file extension for resources at your origin web server and a Cache Everything Cache Rule matching the following expression:

* Using the Expression Builder: `Hostname contains "example.com" AND URI Path ends with ".shtml"`
* Using the Expression Editor: `(http.host contains "example.com" and ends_with(http.request.uri.path, ".shtml"))`

## Add a query string to a resource’s URL to mark the content as static

For example, add a `static=true` query string for resources at your origin web server and a Cache Everything Cache Rule matching the following expression:

* Using the Expression Builder: `Hostname contains "example.com" AND URI Query String contains "static=true"`
* Using the Expression Editor: `(http.host contains "example.com" and http.request.uri.query contains "static=true")`

Resources that match a Cache Everything Cache Rule are still not cached if the origin web server sends a Cache-Control header of `max-age=0`, `private`, `no-cache`, or an `Expires` header with an already expired date. Include the [Edge Cache TTL](https://4f1c5cd2.previews.developers.cloudflare.com/cache/how-to/cache-rules/settings/#edge-ttl) setting within the Cache Everything Cache Rule to additionally override the `Cache-Control` headers from the origin web server.

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