Cloudflare Workers for Ad Traffic Filtering: A Serverless Approach

Cloudflare Workers sit at the edge, making them perfect for filtering ad traffic before it reaches your server. Why Edge-Based Filtering? Latency: <5ms added to request Scale: Handles millions of requests Cost: Pay-per-request pricing No infrastructure: Serverless Implementation export default { async fetch(request, env) { const ip = request.headers.get('CF-Connecting-IP'); const ja3 = request.headers.get('CF-JA3'); const country = request.headers.get('CF-IPCountry'); // Layer 1: IP reputation const ipScore = await checkIPReputation(ip, env); if (ipScore < 20) { return new Response('', { status: 403 }); } // Layer 2: TLS fingerprint if (KNOWN_BOT_JA3.includes(ja3)) { return serveSafePage(request); } // Layer 3: Pass to origin with scoring headers const modifiedRequest = new Request(request, { headers: { ...Object.fromEntries(request.headers), 'X-Bot-Score': ipScore.toString(), 'X-TLS-Risk': ja3Risk.toString() } }); return fetch(modifiedRequest); } }; Performance Average latency a