Question/Feature Request: ODoH as primary with DoH fallback

[n00br00t]

Hi, I run my own ODoH infrastructure (Cloudflare Worker relay + modoh-server target) alongside my own DoH server. I want ODoH as the primary protocol and DoH to take over only when ODoH is failing (e.g. during 502s from the target).

I've tried several approaches without success:

• lb_strategy = 'first' — doesn't enforce protocol priority, just latency
• lb_strategy = 'wp2' — mixes both servers based on performance, DoH often wins since it's faster
• Listing ODoH first in server_names — no effect on actual priority

Is there any existing config that allows this? Something like: "always use ODoH, fall back to DoH only if ODoH fails or returns errors".

If this isn't currently possible, would it be feasible to add a fallback option per server or route? Something like:

[static.'odoh-target']
stamp = '...'
fallback = 'doh'

Thanks!