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Novandri.

Currently learning data science & applied AI

I build for the web — and I'm going deep on data science & AI.

I'm Novandri R., a web developer who spent years on WordPress builds and SEO — from freelance sites to the Ministry of Health — now building with Next.js and going deep on machine learning, RAG systems, and AI agents. I write about what I learn along the way.

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Latest writing

Deep dives on AI, RAG, and agent engineering.

Crawlingrobots.txtAI Search

AI Crawlers Are Not Googlebot: How to Govern Crawlers You Don't Control

A practical, evidence-based guide to AI crawler user agents, robots.txt governance, and the emerging IETF preference standard for AI usage.

12 min read
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HTTPCachingWeb Infrastructure

Cache-Control Is a Contract, Not a Suggestion: Reading HTTP Freshness Correctly

How RFC 9111 freshness, revalidation, and Age actually work — and why s-maxage, stale-while-revalidate, and Vary decide what your users see.

8 min read
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TLSSecurityWeb Infrastructure

Certificate Transparency: What the Public Logs Prove, and What They Don't

How CT logs, SCTs, and Merkle trees work, why browsers enforce them, and how to check your own certificates for transparency.

8 min read
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The web today, the models tomorrow.

Want to talk frontend, data science, or where the two meet? I'm always up for a good technical conversation.

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