---
description: A Pages Functions for appending CORS headers.
title: Adding CORS headers
image: https://developers.cloudflare.com/og-docs.png
---

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# Adding CORS headers

A Pages Functions for appending CORS headers.

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/pages/functions/examples/cors-headers/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

This example is a snippet from our Cloudflare Pages Template repo.

```ts
// Respond to OPTIONS method
export const onRequestOptions: PagesFunction = async () => {
	return new Response(null, {
		status: 204,
		headers: {
			"Access-Control-Allow-Origin": "*",
			"Access-Control-Allow-Headers": "*",
			"Access-Control-Allow-Methods": "GET, OPTIONS",
			"Access-Control-Max-Age": "86400",
		},
	});
};

// Set CORS to all /api responses
export const onRequest: PagesFunction = async (context) => {
	const response = await context.next();
	response.headers.set("Access-Control-Allow-Origin", "*");
	response.headers.set("Access-Control-Max-Age", "86400");
	return response;
};
```

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```