Grist Core OIDC issue - well known URL

[kirincorleone]

Hey, thanks for this project!

I have successfully used it for getoutline oidc, however I am facing problems with Grist

Grist OIDC is the configuration doc for OIDC.

Below are the env variables i used:

GRIST_OIDC_IDP_ISSUER=http://oidc-server.domain/oauth/authorize/
GRIST_OIDC_IDP_CLIENT_ID=clientid
GRIST_OIDC_IDP_CLIENT_SECRET=secret
GRIST_OIDC_SP_HOST=http://grist.domain
GRIST_OIDC_IDP_SCOPES=email openid profile

It may not be helpful, but below is the error from grist logs:

stderr OPError: expected 200 OK, got: 404 Not Found
stderr    at processResponse (/grist/node_modules/openid-client/lib/helpers/process_response.js:41:11)
stderr    at Issuer.discover (/grist/node_modules/openid-client/lib/issuer.js:179:18)
stderr    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
stderr    at async OIDCConfig._initClient (/grist/_build/app/server/lib/OIDCConfig.js:239:24)
stderr    at async OIDCConfig.initOIDC (/grist/_build/app/server/lib/OIDCConfig.js:149:9)
stderr    at async OIDCConfig.build (/grist/_build/app/server/lib/OIDCConfig.js:102:9)
stderr    at async Object.getMiddleware (/grist/_build/app/server/lib/OIDCConfig.js:323:28)
stderr    at async FlexServer.addLoginMiddleware (/grist/_build/app/server/lib/FlexServer.js:1083:33)
stderr    at async main (/grist/_build/app/server/mergedServerMain.js:86:5)
stderr    at async main (/grist/_build/stubs/app/server/server.js:143:20) {
stderr  error: 'expected 200 OK, got: 404 Not Found'
stderr}

I suspect that the examples for other apps in this doc Grist OIDC imply the GRIST_OIDC_IDP_ISSUER requires a .well-known url.

If so, would you be able to help out?