what is FLAPON & PROPFIND ?

Hello,

I'm getting quite a few of the errors below in my cache.log log file.
Whenever I get a FLAPON message squid behaves wired for a few minutes....
Does anybody know what these messages mean and if it's a problem how to fix it.

1999/06/04 00:03:35| parseHttpRequest: Unsupported method 'FLAPON'
1999/06/03 15:06:29| parseHttpRequest: Unsupported method 'PROPFIND'

Thanks
JB
Received on Thu Jun 03 1999 - 09:08:40 MDT