How to access a url only from APEX

Hi all.
We have a system that is accesible from internet, We are trying to secure the access to this system via login from APEX in order to deny the access to the URL if the request is not from our APEX app.
We configured the corresponding hostname in our APEX server and some firewall rules, but when a client clicks the link the hostname is looked in the client's computer, so is never found.
Is there any way to make this hostname resolution in the server's side?
Thanks in advance, regards.

sKC,
You may need to explain yourself in more detail
"How do I access a URL only from APEX?"
If you are trying to limit access to "mynormal.server.com" by seeing if the end user clicked on a link from "myapex.server.com", the answer is:
You don't.
Trying to limit access to a web page based on how you got there is a really really bad form of security due to the false sense of security it implies.
It is so bad that it is better to not even try.
reason:
All URL requests can be easily manipulated by the client computer that is making the request.  (ie the request is easily faked.)
The Unix utility wget can be used to fake the 'referrer' information.
MK

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