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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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Why are people closing this?? This is a legitimate technical question –  leora Mar 19 '11 at 3:04
It's likely getting an "F" because it has a Vary:* header. –  EricLaw -MSFT- Mar 19 '11 at 3:07
We're voting to move it to meta, where it belongs, as it's about the site itself. –  cHao Mar 19 '11 at 3:07
@cHao - but thats just a coincidence . . i am fine moving it to meta (can i do this myself??) but it seems like it could belong in either –  leora Mar 19 '11 at 3:10
F stands for fabulous –  Adam Davis Mar 19 '11 at 4:08
See also "Yahoo's Problems Are Not Your Problems": codinghorror.com/blog/2007/08/… –  Piskvor Mar 19 '11 at 5:34
Related: meta.stackexchange.com/questions/82225/… –  balpha Mar 19 '11 at 18:22

1 Answer 1

up vote 3 down vote accepted

YSlow gives me grade D for Expires headers,

enter image description here

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.

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