Domain lookups are case sensitive

[a-h]

As per a recent post on the Gemini mailing list, Matthias Portzel noted that he was preforming a case-sensitive hostname match, and that various other server Gemini implementations don't execute case-sensitive hostname matching, the behaviour of which is clarified in RFC 1034 as per Stephane Bortzmeyer's post.

a-h/gemini is currently doing case-sensitive lookups, and it shouldn't be, as can be tested on my own capsule - gemini://capsule.adrianhesketh.com

[a-h]

If your users are experiencing this, you'll see a similar error in your server logs:

{"level":"INFO","msg":"gemini: failed TLS handshake","reason":"gemini: certificate not found for \"a-h.GEMINI\"","remote":"127.0.0.1:55359","time":"2021-11-21T14:06:49Z"}