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

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# Adding CORS headers

A Pages Functions for appending CORS headers.

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

TypeScript

```
// Respond to OPTIONS methodexport 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 responsesexport 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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```