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JavaScript · TypeScript ; import { DurableObject } from "cloudflare:workers"; // Worker · export default { · async fetch(request, env, ctx) { · if (request.url.endsWith("/websocket")) { · // Expect to receive a WebSocket Upgrade request. // If there is one, accept the request and return a WebSocket Response. const upgradeHeader = request.headers.get('Upgrade'); if (!upgradeHeader || upgradeHeader !== 'websocket') { · return new Response('Durable Object expected Upgrade: websocket', {...