Simon Willison’s Weblog

The X-Robots-Tag HTTP header. News to me, but both Google and Yahoo! have supported it since last year. You can add per-page robots exclusion rules in HTTP headers instead of using meta tags, and Google’s version supports unavailable_after which is handy for content with a known limited shelf-life.

# 9th June 2008, 9:21 am / google, http, robots-txt, xrobotstag, yahoo

Yahoo!’s Latest Performance Breakthroughs. 20 new performance tips to join the previously published 14. Flushing the buffer while the backend code is still working to cause the browser to start loading CSS earlier is interesting.

# 20th March 2008, 3:17 pm / css, http, performance, yahoo