It appears that nzb360 uses a very old version of okhttp (I'm seeing user agents okhttp/2.7.5 and okhttp/3.9.1 in my logs), which do not support HTTP/2 or TLS 1.3 among other things.
Later versions do. Can it please be updated?
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nzb360 makes connections to web services with HTTP/1.1 even through proxies that support HTTP/2, as my nginx access log shows: "GET /sabnzbd/api?mode=version&output=json&apikey=<redacted>&output=json HTTP/1.1" 200 20 "-" "-" HTTP/2 has performance advantages which should improve speeds on remote con...