sbbs.el

There are decoding issues when opening non-ASCII text, such as on https://bbs.jp.net/mona. 

Instead of 

There's this new board for everything related to Japanese culture.
　　　　　 ⋁
　　　　　　　　　　∧＿∧
　　　 ∧＿∧ 　（´<_｀ 　）　∠This is incredibly original.
　　　（　´_ゝ`）　/　　 ⌒i 　　
　　 ／　　　＼　 　　　|　| 　　　　　　
　　/　　 　/￣￣￣￣/　| 　　　　　　　　　
＿_(__ﾆつ/　 FMV　 / .| .|＿＿＿＿
　　　 ＼/＿＿＿＿/　（u　⊃

one gets

There's this new board for everything related to Japanese culture.
\343\200\200\342\200...

and so on.

Looking further into this, I think this might be a schemebbs issue, or at lease an issue with the configuration of textboard.org. 

I ran 

$ curl -I https://bbs.jp.net/sexp/mona/10
HTTP/1.1 200 OK
Server: nginx/1.18.0
Date: Sun, 31 May 2020 12:28:44 GMT
Content-Type: text/x-scheme
Content-Length: 6175
Last-Modified: Fri, 29 May 2020 18:22:58 GMT
Connection: keep-alive
ETag: "5ed15302-181f"
Accept-Ranges: bytes

where the Content-Type is just "text/x-scheme", without any encoding data. I'm not sure how url.el handles this, but in eww the same post gets rendered correctly.

There have been some comments on the issue here: http://textboard.org/prog/39/263