Simon Willison’s Weblog

Rack. “Rack provides an minimal interface between webservers supporting Ruby and Ruby frameworks”. Ruby’s equivalent of WSGI has just hit v0.1.

Posted 4th March 2007 at 8:49 pm

Recent articles

Useful patterns for building HTML tools - 10th December 2025
Under the hood of Canada Spends with Brendan Samek - 9th December 2025
Highlights from my appearance on the Data Renegades podcast with CL Kao and Dori Wilson - 26th November 2025

rack 2 ruby 72 wsgi 28

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