So I'm creating an ultra optimized site, and my page load speed with https://developers.google.com/speed/pagespeed/ is 99 (out of 100).
The only thing keeping me away from full hundred is this:
By specifying a cache validator - a Last-Modified or ETag header - you ensure that the validity of cached resources can efficiently be determined.
What?! I don't know what should I do. How do I set a cache validator for google webfonts?
I've the webfont like this: <link href='http://fonts.googleapis.com/css?family=Open+Sans:400,800' rel='stylesheet' type='text/css'>
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I'm on ubuntu with apache2 if that matters.
Downloading the webfont to server and using it from there drops the score to 96 so that won't help either.