need an iRule that contains a static read only username and password when accessing certain links

1. User logs into Oracle, F5 is LTM only, and Oracle does the authentication.

2. User clicks on a link to download an item, such as /documents

3. /documents is actually a different backend server. (not sure how i'm doing this yet, vip targeting vip maybe?)

4. when the user requests a doc that exists on this other backend server, the f5 needs to send a username/pass to it, which will be a read-only service account, but also verify that the request is coming from an authenticated oracle session... so i'm thinking it will need to validate via a cookie obtained from the Oracle session.

Hopefully this makes sense... I think the initial hurdle is an iRule that contains and sends a static user/pass.

Thanks