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Obviously the main server can also act as middleware: intercepting/modifying the request before proxying it to the auxiliary and/or modifying the auxiliary's response before returning to the client.

So, there will be a main server in front of any number of auxiliary servers, each potentially running on a different runtime/cloud provider etc. Main will handle some routes itself while proxying others to the auxiliaries. We have a working POC even w/o then envs API. It will be much better with it.