I need to redirect www.xyz.com to www.abc.com but ineed to maintian original www.xyx.com url

Hi folks: I need to redirect this url to but I need to maintain original url.

I am using this irule: when HTTP_REQUEST { if { [HTTP::host] equals "; } { HTTP::header replace host "; HTTP::redirect "; } } But dosn´t works, could anyone help me? Thanks Jotace