users，您好！
I have a trouble with set expires time with apache!
I want to expires statement to control the cache time,But there is a strange problem occurd!
when i set ExpiresActive on
ExpiresByType text/html A61 ，
the cache server （squid）work correctly and the expires time is 61 seconds!
But if i set the time less the 61，the cache server can't cache!!
ExpiresActive on
ExpiresByType text/html A60
I found 60 seconds is a bottleneck whatever i use apache 2.0.X or 2.2.X ，
and i found it's a puzzle for me!
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