Very basic POC to test CloudFlare workers with KV and waitUntil

kv-poc.js

addEventListener('fetch', event => event.respondWith(handleRequest(event)));

async function handleRequest(event) {
  const request = event.request;
  // Parse query string
  const { searchParams } = new URL(request.url);
  let qsName = searchParams.get('name');
  // If name in query string, add it to kv async
  if (qsName) {
    // Run this async to response, but wait for it to complete before terminating
    event.waitUntil((() => new Promise((resolve) => {
      // Wait for 3 seconds just to cause a delay
      setTimeout(async () => {
        await MyFirstKv.put("name", qsName);
        resolve();
      }, 3000);
    }))());
  }
  // Get current name from KV
  let kvName = await MyFirstKv.get("name") || "world";
  const response = new Response(`Hello, ${kvName}!`, {
    headers: { "content-type": "text/plain" }
  });
  // Send response
  return response;
}