Newer qBittorrent renamed its session cookie from "SID" to "QBT_SID" /
"QBT_SID_<port>" (the diagnostic revealed cookies=['QBT_SID_5080']). The
client only accepted "SID", so a valid login (cookie present in the jar) was
reported as "Unexpected response". Re-entering correct credentials never
helped because login was succeeding all along.
Treat any cookie named "SID" OR starting with "QBT_SID" as the session
cookie, checked in both the parsed jar and the raw Set-Cookie header.
qBittorrent only sets this cookie on a valid login, so it stays authoritative.
Diagnostic message updated to mention both names.
New regression test covers the QBT_SID_<port> case. 388/388 backend tests
pass; ruff clean.
Developer
39775a82ef