Send timestamp to origin as a custom header
Convert timestamp to hexadecimal format and send it as a custom header to the origin.
export default {  async fetch(request) {    // Get the current timestamp    const timestamp = Date.now();
    // Convert the timestamp to hexadecimal format    const hexTimestamp = timestamp.toString(16);
    // Clone the request and add the custom header    const modifiedRequest = new Request(request, {      headers: new Headers(request.headers),    });    modifiedRequest.headers.set("X-Hex-Timestamp", hexTimestamp);
    // Log the custom header for debugging    console.log(`X-Hex-Timestamp: ${hexTimestamp}`);
    // Pass the modified request to the origin    const response = await fetch(modifiedRequest);
    return response;  },};