How to set up two Mikrotiks for processing on one web traffic?

Question

Mikrotik

Hello!
this is my first question, I hope for your help
and the task is there are two mikrotik one main second additional, and it became necessary to separate the web traffic from the main one to send it to the additional one (process) and return it back to the main one,
i.e. Two Mikrotiks are connected by two patchcards.
Here it was possible to redirect from the main web (using mangle and mark route), on the second one it was possible to process it, but how to return it correctly is a bit unsure. By what principles and rules. ?
PS: nat is not used, addresses are white

Answer 1

why such perversions?
on the main dst-nat from port 80 of the white address to port 80 of the second.
and then either you prescribe a default for the second gateway as the first one, or you prescribe a default route through the main one with marking (for example main),
in the mangle make a mark connection (for example from_main) to traffic coming from the main one, at the output of connections with the label from_main do mark routing with the label main so that the traffic goes back to the main one.

Answer 2

You have a very strange configuration, but I can assume that you are looking for balancing. If so look towards VRRP:
wiki.mikrotik.com/wiki/Manual:Interface/VRRP