Simon Willison’s Weblog

22nd September 2007 - Link Blog

robots.txt Adventure. Interesting notes from crawling 4.6 million robots.txt, including 69 different ways in which the word “disallow” can be mis-spelled.

Posted 22nd September 2007 at 12:36 am

Recent articles

I vibe coded my dream macOS presentation app - 25th February 2026
Writing about Agentic Engineering Patterns - 23rd February 2026
Adding TILs, releases, museums, tools and research to my blog - 20th February 2026

This is a link post by Simon Willison, posted on 22nd September 2007.

andrew-wooster 1 crawling 13 robots-txt 10

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe