Figured it out.
The Expires header ("Sun, 3 Mar 2013 13:28:24 GMT") is using a single digit
for the date. If I change the "3" to "03", Nginx works as expected. RFC
1123 and RFC 822 say that both one- and two-digit numbers are valid, so this
is a bug in Nginx's caching. I'll report it to the bug tracker.
Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,236852,236855#msg-236855
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