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Showing content from https://developers.cloudflare.com/rules/snippets/examples/define-cors-headers/ below:

Define CORS headers · Cloudflare Rules docs

// Define CORS headers

const corsHeaders = {

"Access-Control-Allow-Origin": "*", // Replace * with your allowed origin(s)

"Access-Control-Allow-Methods": "GET, POST, PUT, DELETE, OPTIONS", // Adjust allowed methods as needed

"Access-Control-Allow-Headers": "Content-Type, Authorization", // Adjust allowed headers as needed

"Access-Control-Max-Age": "86400", // Adjust max age (in seconds) as needed

};

export default {

async fetch(request) {

// Make a copy of the request to modify its headers

const modifiedRequest = new Request(request);

// Handle preflight requests (OPTIONS)

if (request.method === "OPTIONS") {

return new Response(null, {

headers: {

...corsHeaders,

},

status: 200, // Respond with OK status for preflight requests

});

}

// Pass the modified request through to the origin

const response = await fetch(modifiedRequest);

// Make a copy of the response to modify its headers

const modifiedResponse = new Response(response.body, response);

// Set CORS headers on the response

Object.keys(corsHeaders).forEach((header) => {

modifiedResponse.headers.set(header, corsHeaders[header]);

});

return modifiedResponse;

},

};


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