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// Returns JS for an action, regardless of the URL.
function handleRequest(request, response) {
// Allow cross-origin, so you can XHR to it!
response.setHeader("Access-Control-Allow-Origin", "*", false);
// Avoid confusing cache behaviors
response.setHeader("Cache-Control", "no-cache", false);
// Write response body
response.write('registerAsyncCallback("action", async () => {});');
}