Amos, assuming Facebook does not listen, is there a way around invalid dates?  

I have added the '-i' option to the refresh_pattern.  I do not have any other 
refresh_patterns defined.  I like to keep things simple if I can.  
    Thanks, Norbert

>Amos wrote:
>> General: The Expires header's value isn't a valid date.

> That above is probably the killer. As we get closer to HTTP/1.1 
> compliance we get more things discarded for non-compliance.
> 
> Invalid date maps to "-1" and non-cacheable.
> 

>> refresh_pattern (cgi-bin|\?)    0       0%      0

> The pattern should be   -i (/cgi-bin/|\?)  for best effect.
>
> Any other refresh_patterns in use?  Those URL look suspiciously like 
> ones which would be caught by trying to handle mime in refresh_pattern.

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