Simulator Cache Hit Ratio & Edge Computing

Parameter Beban Traffic & Edge Cache

// cloudflare-worker.ts (Edge Caching with Tagged Invalidation)
export default {
  async fetch(request: Request, env: Env, ctx: ExecutionContext) {
    const url = new URL(request.url);
    const cacheKey = new Request(url.toString(), request);
    const cache = caches.default;

    // 1. Cek Cache di Edge Point of Presence (Jakarta PoP ~18ms)
    let response = await cache.match(cacheKey);
    if (response) {
      const headers = new Headers(response.headers);
      headers.set('X-Edge-Cache', 'HIT');
      return new Response(response.body, { ...response, headers });
    }

    // 2. Fetch ke Origin Server hanya jika Cache Miss
    response = await fetch(request);

    // 3. Simpan di Edge Cache dengan Stale-While-Revalidate
    if (response.status === 200) {
      const responseToCache = response.clone();
      const headers = new Headers(responseToCache.headers);
      headers.set('Cache-Control', 'public, s-maxage=3600, stale-while-revalidate=86400');
      ctx.waitUntil(cache.put(cacheKey, new Response(responseToCache.body, { ...responseToCache, headers })));
    }

    return response;
  }
};