Forward proxy vs Reverse proxy and Proxy Cache features

[cachenewbie]

Thanks mat h

Anyone else has answers to 1 to 3 ?  There was a typo in my original
post . [2] is supposed to read "What are the "caching" features that are
critical (compared to squid) that are missing in *nginx* " 

Thanks.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,134286,134576#msg-134576