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From zcat <>
Subject Re: [users@httpd] Apache improvement suggestion
Date Thu, 12 May 2005 03:41:14 GMT
>>>1. How do I check for *no* referer field ?
>>Apache usually prints "-" in the log if the referer is not defined. But it depends
on whatever you are using to check the referer in the first place.
> Right.  You need to tell us the blocking method you are using.
> An example is here:

Some firewalls/proxies change referrer to 
"XXXX:++++++++++++++++++++++++++++++++++++++++++++++++++" (my logs 
contain many similar entries with differing numbers of +), so it might 
be a good idea to make a blacklist of known unauthorised links rather 
than a 'whitelist' of you own URL and recognised 'masked' referer headers.

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