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expiresByType caching
i see below warning/errors. nothing else:
Warning generated : /Common/cache_2:13: warning: [use curly braces to avoid double substitution][([clock seconds]+$expire_content_timeout)]
and i don't know why from time to time this one (but it is rare error): err tmm[9390]: 01220001:3: TCL error: /Common/cache_2 - can't read "expire_content_timeout": no such variable while executing "if { $expire_content_timeout ne "" } { HTTP::header replace "C ache-Control" "max-age=$expire_content_timeout, public" HTTP::header replace "..."
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