From one url to another

Guys i need your help 

Lets say when users type in their browser www.abc.comsites/pages/technology. I want the f5 to keep displaying to the users the same URL without changing it, but when the f5 is connects to the backend nodes, i want it to change the url from www.abc.to.comsites/pages/technology to www.aps.snap.comsites/pages/technology. Cause the backend nodes will only authenticate user coming from the www.aps.snaps.comsites/pages/technology

regards