I have a server serving 12 support domains and a path (see config below). Because of “Windows” I’m not using headers, SNI or DNS to direct traffic. It’s IP addresses and port numbers, HTTP/1.0-style.
Despite all the headache of Windows, it has a few good things here and there though, for instance; this server is actually part of a cluster, it’s kept on sync completely transparently using Active Directory-backed DFS replication and has centralized certificates, the same files used by HAProxy, a script makes the adjustments whenener new ones are issued and places them in a domain-joined SMB share (macOS Server) for IIS to get. It’s really nice and useful for serving static, or domain-authenticated stuff, and… no, that’s it.
I’d like to add the other servers of the cluster to HAProxy to have HA and not just Proxy but I’m fearing I’d need to split the single backend I have into 12 backends (and growing). My config file is around 1200 lines as it is.
Is that correct? I’m very OK to be told I’m wrong, please, let me have it. 
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