plzhans (Son Won Chul) @plzhans

A blog documenting the troubleshooting behind things I've built.

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Cloudflare

Controlling AI Crawlers with robots.txt - How to Allow Search, Training and Agents Separately
Controlling AI Crawlers with robots.txt - How to Allow Search, Training and Agents Separately AI crawlers have added more to write in robots.txt. A rundown of per-purpose bot names, Google-Extended and Content-Signal.
Web Sep 16, 2026
Blocking AI Bots with Cloudflare - Managed robots.txt and AI Crawl Control
Blocking AI Bots with Cloudflare - Managed robots.txt and AI Crawl Control Cloudflare writes robots.txt on your behalf and blocks AI bots at the edge. It also shows you which bots took how much.
Web Sep 16, 2026
Cloudflare Workers Static Site Guide - From Deployment to SEO
Cloudflare Workers Static Site Guide - From Deployment to SEO Putting a static site on Cloudflare, then layering code in front of it to improve SEO. A signpost for a four-part series.
Web Sep 11, 2026
Cloudflare Workers Static Site Hosting - Request Flow and Billing
Cloudflare Workers Static Site Hosting - Request Flow and Billing What Workers Static Assets is and the order in which a request flows. When the Worker runs and when you get billed. What you need to know before layering dynamic processing onto a static site.
Web Sep 11, 2026
How to Improve React SPA SEO - From Meta Tags to SSR with Cloudflare Workers
How to Improve React SPA SEO - From Meta Tags to SSR with Cloudflare Workers Put a React SPA on static hosting and the raw HTML is an empty shell. A record of improving it step by step with nothing but Cloudflare Workers — no new server.
Web Sep 11, 2026
How to Set Up Caching in Cloudflare Workers - Edge Cache and Tiered Cache
How to Set Up Caching in Cloudflare Workers - Edge Cache and Tiered Cache Two ways to cache when a Worker calls an external API, and the three traps you will definitely hit if you don't know about them. Per-data-center cache, Tiered Cache, and cache keys.
Web Sep 11, 2026
How to Use wrangler - Local Development and Deployment for Cloudflare Workers
How to Use wrangler - Local Development and Deployment for Cloudflare Workers Installing wrangler and setting up types, booting workerd with wrangler dev, and deploying. Starting with the fact that wrangler dev is not a frontend dev server.
Web Sep 11, 2026