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@carsten Something is off with your server. I have a lot of trouble with the official twtxt client's Python AsyncIO to fetch your feed for a few days. Always get a
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ServerTimeoutError('Connection timeout to host https://yarn.zn80.net/user/carsten/twtxt.txt'). It turns out, both IPv4 and IPv6 addresses are resolved and the v6 one is preferred. However, connecting via v6 (2606:54c0:5540:18::14:2a4) fails and an attempt with v4 (81.172.204.59) is not made at all, the whole thing just aborts. :-( (I believe this is an error with aiohttp.)
Aha, @carsten@yarn.zn80.net! „Im Gegensatz zum ICMP bei IPv4 ist ICMPv6 zwingend für den Betrieb von IPv6 nötig. Ein generelles Blockieren von ICMPv6 auf der Firewall führt dazu, dass IPv6 nicht funktioniert (vgl. RFC 4890).“ – https://de.wikipedia.org/wiki/ICMPv6 (Translation for the English speaking world: In contrast to ICMP for IPv4, ICMPv6 is mandatory for the operation of IPv6. Generally blocking ICMPv6 on the firewall causes IPv6 not to function.)