Squid reverse proxy. how to deny all others URL, not listed in rules?

[pix]

on pfSense 2.3.2-RELEASE-p1
Squid 0.4.23_2

I have published few my internal web servers to some different external names

for example:
https://server1.example.com
https://server2.example.com
https://server3.example.com

works fine!

BUT:

when I try
https://someelsename.example.com
I have standart SQUID error page "requested URL cannot be reached"

I dont want it!
I want just request timeout in this case!

how can I get this solution ?