[squid-users] Squid denies access to Yahoo Mail when word "ass" is on the bad_strings.acl file.

I created a file called "bad_strings.acl" wich are words that are associated
to porn content and for words that can be associated to potential hazardous
sites on the web, like hack, warez etc.

Everything seemed to be working fine until except for the Yahoo! Mail. Some
people on the network use Yahoo! Mail
(http://login.yahoo.com/config/mail?.intl=br) and the login site opens Ok
but the problem is:

When I have the word ass, Squid blocks the login process with this response:

ERROR
The requested URL could not be retrieved
----------------------------------------------------------------------------

----
While trying to retrieve the URL:
http://us.rd.yahoo.com/reg/login0/no_suli/login/br/ym/*https://login.yahoo.com/config/login?
The following error was encountered:
Access Denied.
Access control configuration prevents your request from being allowed at
this time. Please contact your service provider if you feel this is
incorrect.
But if I take the word "ass" out of the "bad_strings.acl" it works fine. I
searched for the string ass anywhere in that url and found nothing. Has
anybody encountered this problem before?
Anyway: By commenting or erasing that line from the "bad_strings.acl" Yahoo!
Mail works fine. But I would like to make it work with that string on the
file.