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Web extraction, LLMs, and building in public.

Technical deep dives on web extraction, content parsing for LLMs, anti-bot bypass, and building open-source infrastructure in Rust. Written by the team behind webclaw.

webclaw turns any website into clean, structured content for AI applications. These posts cover the engineering decisions, trade-offs, and lessons learned building a web extraction toolkit from scratch.

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Anti-Bot Scraping API: Browser Fallback Signals
May 19, 2026·Massi

Anti-Bot Scraping API: Browser Fallback Signals

The exact block markers, JA4 fingerprints, empty shells, anti-bot cookies, JavaScript heuristics, and content-quality signals that decide when a scraping API should escalate to a browser.

Anti-Bot Scraping API: Skip the Browser, Keep the Speed
May 14, 2026·Massi

Anti-Bot Scraping API: Skip the Browser, Keep the Speed

An anti-bot scraping API that detects the block first, then escalates to a browser only when needed. Faster and cheaper, with clean markdown or JSON out.

How to evaluate web scraping APIs for AI agents
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May 12, 2026·Massi

How to evaluate web scraping APIs for AI agents

A practical checklist for testing web scraping APIs on real agent and RAG workflows, not toy URLs like example.com.

Migrating from Firecrawl: compatible API for AI agents
May 8, 2026·Massi

Migrating from Firecrawl: compatible API for AI agents

Already using Firecrawl? Learn how Firecrawl-compatible endpoints work, what to test before switching, and how to evaluate webclaw with your existing scrape and crawl calls.

Cloudflare Scraping Checklist: Diagnose the Block in 2026
May 5, 2026·Massi

Cloudflare Scraping Checklist: Diagnose the Block in 2026

A checklist for Cloudflare scraping failures. What to log, what each signal means, and when to change fingerprint, session, rate limit, or render in a browser.

JA4 Fingerprints Decoded: Format, Bot Score, curl 403s
Apr 30, 2026·Massi

JA4 Fingerprints Decoded: Format, Bot Score, curl 403s

Cloudflare fingerprints your TLS and HTTP/2 handshake with JA3 and JA4 — that is why curl gets 403 and Chrome gets 200 on the same request. How browser-grade clients flip the result.

Cloudflare Error 1020, 1015, 403, 503: Causes and Fixes
Apr 28, 2026·Massi

Cloudflare Error 1020, 1015, 403, 503: Causes and Fixes

Cloudflare 403, 503, 1020, 1015 each mean a different block. A decision tree to read the code, find the failing layer, and fix it. Includes error 1020.

Puppeteer Stealth vs Cloudflare: Which Evasions Still Fail
Apr 24, 2026·Massi

Puppeteer Stealth vs Cloudflare: Which Evasions Still Fail

puppeteer-extra-plugin-stealth still gets caught by Cloudflare in 2026. The network, request, and session signals that give it away, and what to run instead.

Cloudflare Turnstile: How It Works and Why Checks Fail
Apr 21, 2026·Massi

Cloudflare Turnstile: How It Works and Why Checks Fail

Understand Cloudflare Turnstile, its three widget modes and token validation. Distinguish a Turnstile failure from a challenge page or a blocked request.

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