Error code 151 on login after applying PR #29 fixes

[Pompeijwag]

Error code 151 on login after applying PR #29

Environment:

• Python 3.13
• Starting point: PR Fix compatibility with latest MajSoul server config format #29

Even starting from this PR, I found that gateway discovery step still hangs and never compeletes. So I have hardcoded an endpoint instead:

endpoint = "wss://route-2.maj-soul.com/gateway"

The main issue I have is the error 151. After getting the connection working, every login attempt returns error code 151 with json_param: {"version_str": "web-0.11.252"}. I have tried both version and force_version from the version.json response (web-0.11.252 and web-0.10.0) and all gateways from the config (route-2 through route-6), all result in the same error.

I can see error 151 has been reported before in issue #12, with earlier was a result of a version mismatch if I understand correctly? Maybe I am missing something. Is this something that you can help me with?

Full log output:

2026-06-04 11:40:05 INFO: Version: {'version': '0.11.252.w', 'force_version': '0.10.0.w', 'code': 'v0.11.252.w/code.js'}
2026-06-04 11:40:05 INFO: Chosen endpoint: wss://route-2.maj-soul.com/gateway
2026-06-04 11:40:05 INFO: Connection was established
2026-06-04 11:40:06 ERROR: Login Error:
2026-06-04 11:40:06 ERROR: code: 151
json_param: "{\"version_str\":\"web-0.11.252\"}"

[EpicOrange]

Hey! I've written a bit about the error 151 here: Longhorn-Riichi/InjusticeJudge#37 (comment)

The short version is that MajSoul no longer accepts the version 0.11.* login flow, we're at 0.16.* now. Luckily there are only a few changes; in particular there is now a rpc requestConnection that needs to be called prior to oauth2Auth, otherwise you get error 151 even if you present all the right fields to oauth2Auth.