Recently, Firefox team announced that they will use Cloudflare DoH service and there was an insightful blog post by Daniel Stenberg:
Example of using dns2doh tool is using path containing .well-known
I did install Firefox Nightly to try it out, and about:config shows that Firefox is using this path:
Official documentation references only simple /dns-query path:
Cloudflare proxy also uses /dns-query without .well-known:
Are /.well-known/dns-query, .well-known/dns and /dns-query different somehow? Or exactly the same?