plzhans (Son Won Chul) @plzhans

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

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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
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
Building a Hugo Blog - From Start to SEO A step-by-step guide to building a blog with Notion→Hugo→GitHub Pages, connecting a custom domain, adding multilingual support, and applying security headers.
Web Sep 3, 2026
4 Security Headers Flagged by an SEO Audit — Applying Them on Cloudflare Without Code
4 Security Headers Flagged by an SEO Audit — Applying Them on Cloudflare Without Code Explains why SEO audit reports flag HSTS, CSP, X-Content-Type-Options, and Referrer-Policy, and what each header actually does. Covers splitting fixed-value headers into Cloudflare Transform Rules …
Web Aug 30, 2026
Adding Multilingual Support to a Hugo Site
Adding Multilingual Support to a Hugo Site A summary of how to configure baseURL, sitemap, robots, JSON-LD, Open Graph, and meta description in a Hugo multilingual blog, and how to prevent duplicate-content issues with hreflang and canonical. …
Web Feb 11, 2026