[spec] Limit valid encodings of text/gemini to UTF-8

[Côme Chilliet]

Le dimanche 3 janvier 2021, 17:02:54 CET Petite Abeille a ?crit :
> > On Jan 3, 2021, at 14:46, Stephane Bortzmeyer <stephane at sources.org> wrote:
> > UTF-8 has a quasi-monopoly.
> 
> Not quite.
> 
> For text/gemini, your stats read:
> 
> ? Unspecified: 42,322
> ? utf-8: 6,513
> ? us-ascii: 3
> 
> Unspecified rules. By far. Most likely plain ASCII in practice.

No, the specification specifies that default is utf-8, so unspecified is utf-8.
I do not set the charset in my server headers as it is redundant because I always send utf-8.

> Ditto for guessing the actual language:
> 
> # echo $(openssl s_client -quiet -crlf -connect mozz.us:1965 <<< gemini://mozz.us/ 2>/dev/null ) | polyglot detect | cut -d' ' -f1 | uniq
> English
> 
> https://polyglot.readthedocs.io/en/latest/Detection.html

Language is not the same, because the specification explicitely says that there is no default, so my server always send the lang= header tag for text/gemini content.

C?me