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Cache your pages to reduce latency and conserve bandwidth.

News and Follow-ups – 00:40

• Mark sold his soul to Steve Jobs and got a Mac

Geek Tool – 07:41

• KR Tools Autoloader Screwdriver – $24.63

Webapps – 09:58

• PicGhost – Mass image editing via the web
• iPadPeek – See what your sites will look like on an iPad

Topic – 14:42

• Caching
  • What is caching?
  • Why?
    • Reduce latency
    • Reduce network traffic
  • Headers
    • Last-Modified
    • Expires
    • Cache-Control
      • no-cache
      • no-store
      • no-transform.
      • must-revalidate
      • proxy-revalidate>
      • max-age<
      • cache-extension
      • public
    • Etags
      • Implemented differently across different servers
      • User requests a page and returns the etag, if the etag is the same server sends 304 Not Modified, if different sends 200
      • http://joshua.schachter.org/2006/11/apache-etags.html
  • Don’t change files unnecessarily.  For example, don’t re-upload your entire site when you only change a few files as you will have a falsely young last-modified tag.
  • Strategies
    • Set far future expire headers
  • Data caching
    • memcached – A big giant key/value memory store
  • Caching while developing
    • A word of wisdom
  • Tools
    • Great tool that checks all your headers – http://redbot.org/
    • yslow