Masking my subdomain redirection

I am having a problem to musk my domain that I want to forward to a differnt one and still want people to see my subdomain in there browser.

I am forwarding http://subdomain.abc.com to http://clients.xyz.com

and it is showing http://clients.xyz.com in the browser as ususal.

But I still want it to so http://subdomain.abc.com instead.

There must something, that I can do in my .htaccess. Please let me know.

 

 

 

 

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