Adding CORS headers

A Pages Functions for appending CORS headers.

Last updated Apr 21, 2026 This example is a snippet from our Cloudflare Pages Template repo.

// 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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description: Create and deploy your first Pages Function on Cloudflare Pages. title: Get started image: https://developers.cloudflare.com/pages/functions/get-started/og.png?v=c372a0d0afd79c79

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