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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.

/functions/_middleware.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;
};