Replace part of URI

It works but i want to do this :

the client put in URL "something/abc/azerty

F5 modifies this to "thing.abc/azerty"

There is something behind this URL that i don't know (/test/page.html)

When the server behind F5 respond, it sends a 302 to "thing.abc/azerty/noreply.html"

Then the client has a 302 but he don't know this internal URL.

How can i do to modify the response ?

I find

when HTTP_RESPONSE

we can change the "Location" but how to modify the Host-response and the URI-response ?

Thanks !