Stack Overflow's main page gets good grades in YSlow except for an F for Add Expires Headers. I know that SE team members are obsessed with performance. Why don't they put far expiration dates in the headers by configuring IIS?
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migrated from stackoverflow.com Mar 19 '11 at 3:13
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YSlow gives me grade D for Expires headers,
As you can see there, all of those sites are outside stackoverflow network.
And also those are ads, and site stats sites, so expires headers are no much meaningful for such sites.