HTTP Forward Proxy using hosts

Hello,

I have a ASM + SSL Forwarding Proxy license where part of the task is to configure the F5 as a forward proxy for "internal" and external websites.

I have configured the F5 as forwarding proxy by using the iapp"; and it works properly with external websites/domains ( such as google,...) but not on internal websites.

This works because I have a dns resolver assigned to the HTTP Profile, that contact the DNS to resolve the host header. Due to some constraint, the dns does not resolve internal websites such as x.mydomain.com. (Note:I cannot change the customer's DNS behavior) Steps that did not help: .......................... 1- Adding the internal domains to the host file on the F5 "as local dns" did not help. 2- adding mydomain.com as forwarding zone in the dns resolver and pointed to loopback, throw an error that loopbacks are not allowed. 3- adding an irule to direct a traffic to a pool (the internal website) when HTTP_PROXY_REQUEST {

switch [string tolower [HTTP::host]] {
    "x.mydomain.com" {
    pool poolx
    snat snatx

     }
 }

}

So basically, I need to find a way to force the F5 to use its own local dns first for internal domains (internal websites), using the HTTP Proxy mode profile.

thank you in advance for your assistance.

Regards, George