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That's not correct. I just downloaded the same google font css using different user agents, one for Windows Google Chrome and one for OS X Google Chrome. CSS were different, both specified .woff2 format but actual font URLs were different. And downloaded .woff2 files were different as well. I used Open Sans font for that test. http://pastebin.com/edYbfxzU here's log, you can try it yourself.

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Wow, Thanks you for this paste!

I'll look into that and maybe provide some additional fonts on a per OS/Browser basis to download. The main problem is that it's impossible to have a static CSS snippet AND provide different files per User-Agent (a javascript solution might help). So until I've found a solution to this, you are absolutely right, these optimizations will get lost on local use!

For reference: I'm currently using the following User-Agents for fetching the font file urls from Google's CSS: http://pastebin.com/5SZ1Q6kj

I was going to mention this also. I'm currently working around it with conditional comments (serving /fonts/ie/9+/index.css, etc).

Anyway, thanks for your service, bookmarked... (I've been thinking of doing something similar). Good luck with finding a solution to this problem...

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