NULL characters in Header - how to get which sites generate this?

[x-man <x-man@xxxxxxxxxxxx>]

Hi,

my cache.log file is full of this kind of messages:

Content-Type: application/x-www-form-urlencoded
2012/09/13 17:39:35| WARNING: HTTP header contains NULL characters {Accept:
*/*
Content-Type: application/x-www-form-urlencoded}
NULL
{Accept: */*
Content-Type: application/x-www-form-urlencoded
2012/09/13 17:39:35| WARNING: HTTP header contains NULL characters {Accept:
*/*
Content-Type: application/x-www-form-urlencoded}
NULL
{Accept: */*
Content-Type: application/x-www-form-urlencoded

How to find out which site/sites are generating this, so I can bypass
them... 

I'm running squid 3.1.20 as transparent tproxy for many users.

Thanks in advance.



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