Looking at this example mobileconfig, I am trying to find out what happens if a DoH server responds with a status of 4xx or 5xx in responds to a DoH query on iOS. For example, if NGINX is broken or for whatever reason, the DoH server responds with any status other than 200. Does the DNS request completely fail and I will get an error message in Safari? Does the iOS device automatically try another DNS?
What happens if a DNS over HTTPS server responds with status 5xx or 4xx on iOS?
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The specifications are quite clear, see RFC 8484 " DNS Queries over HTTPS (DoH)", section 4.2.1 "Handling DNS and HTTP Errors":
Then the exact behavior will depend on the client used obviously, but that means the question not being really on-topic here as not related to programming.