Simple iRule not working - HTTP::respond KO

I understand that with my initial configuration it's simply not possible. I just explained the reason we configured it that way, and from what I read in your reply it seems it was not a bad idea.

Adding this iRule force us to modify the way we used the VIP before, that's a fact.

Thank you for all your explanations and for the link reference you sent, it helped me to understand the issue.