[users@httpd] What Is This CONNECT Request In My Access Logs?

["David P. Donahue" <ddonahue@xxxxxxxxxxx>]

Every once in a while I get an entry in my access logs like this:

"CONNECT 216.135.96.176:6660 HTTP/1.0" 200 12717

Anyone know what this is?  Is it a malicious attempt of some kind, or 
just some innocent protocol some clients check for for some reason? 
Anything I should be aware of?  Thanks for any info you can offer.


Regards,
David P. Donahue
ddonahue@xxxxxxxxxxx

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