[auth][cause]: OperationProcessingError: "response" is not a conform Token Endpoint response with Keycloak and NextJS

[idc77]

[auth][error] CallbackRouteError: Read more at https://errors.authjs.dev#callbackrouteerror
[auth][cause]: OperationProcessingError: "response" is not a conform Token Endpoint response
    at OPE (webpack-internal:///(rsc)/./node_modules/.pnpm/oauth4webapi@3.1.2/node_modules/oauth4webapi/build/index.js:179:12)
    at processGenericAccessTokenResponse (webpack-internal:///(rsc)/./node_modules/.pnpm/oauth4webapi@3.1.2/node_modules/oauth4webapi/build/index.js:1213:15)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async processAuthorizationCodeOpenIDResponse (webpack-internal:///(rsc)/./node_modules/.pnpm/oauth4webapi@3.1.2/node_modules/oauth4webapi/build/index.js:1419:20)
[auth][details]: {
  "provider": "keycloak"
}
[auth][error] UnknownAction: Cannot parse action at /api/auth/installHook.js.map. Read more at https://errors.authjs.dev#unknownaction
    at parseActionAndProviderId (webpack-internal:///(rsc)/./node_modules/.pnpm/@auth+core@0.37.2/node_modules/@auth/core/lib/utils/web.js:113:15)
    at toInternalRequest (webpack-internal:///(rsc)/./node_modules/.pnpm/@auth+core@0.37.2/node_modules/@auth/core/lib/utils/web.js:37:40)
    at Auth (webpack-internal:///(rsc)/./node_modules/.pnpm/@auth+core@0.37.2/node_modules/@auth/core/index.js:87:103)
    at httpHandler (webpack-internal:///(rsc)/./node_modules/.pnpm/next-auth@5.0.0-beta.25_next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1__react@18.3.1/node_modules/next-auth/index.js:142:82)
    at /home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:63815
    at /home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/lib/trace/tracer.js:133:36
    at NoopContextManager.with (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/@opentelemetry/api/index.js:1:7062)
    at ContextAPI.with (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/@opentelemetry/api/index.js:1:518)
    at NoopTracer.startActiveSpan (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/@opentelemetry/api/index.js:1:18093)
    at ProxyTracer.startActiveSpan (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/@opentelemetry/api/index.js:1:18854)
    at /home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/lib/trace/tracer.js:122:103
    at NoopContextManager.with (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/@opentelemetry/api/index.js:1:7062)
    at ContextAPI.with (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/@opentelemetry/api/index.js:1:518)
    at NextTracerImpl.trace (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/lib/trace/tracer.js:122:28)
    at /home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:56866
    at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
    at Object.wrap (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:37102)
    at /home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:54639
    at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
    at Object.wrap (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:36351)
    at /home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:54601
    at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
    at eU.execute (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:53994)
    at eU.handle (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:65073)
    at doRender (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:1315:60)
    at cacheEntry.responseCache.get.routeKind (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:1525:46)
    at ResponseCache.get (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/response-cache/index.js:49:26)
    at DevServer.renderToResponseWithComponentsImpl (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.1.3_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:1445:53)

AUTH_SECRET="removed" # Added by `npx auth`. Read more: https://cli.authjs.dev
AUTH_KEYCLOAK_ID=next-auth
AUTH_KEYCLOAK_SECRET=removed
AUTH_KEYCLOAK_ISSUER=https://domain.tld/auth/realms/realmname

How can I debug what is happening?
How can I see the response?

update:
It's some kind of issue with Keycloak 26.0.5

I tried Zitadel and it's working.
But still I don't know how to debug this, even with debug enabled, it gives me nothing useful.
I'd like to inspect the response returned from Keycloak.
How?

[panva]

I'd like to inspect the response returned from Keycloak. How?

The OperationProcessingError instance has a cause property which in this case would be the Response instance (assuming you're using a next-auth version dependent on oauth4webapi@3.x, which from the stack trace it looks like you are)

[idc77]

I have provided all the log data, there is no way to inspect the response, do you see the content of the response from the provided log data? I don't.

[idc77]

In https://authjs.dev/getting-started/migrating-to-v5#breaking-changes it says

Auth.js now builds on @auth/core with stricter OAuth/OIDC spec-compliance, which might break some existing OAuth providers. See our open issues for more details.

Which is completely ridiculous, because they demand a reproduction URL, which is absurd to demand, especially when you can't provide clientid and secret from whatever keycloak instance.
Next-auth is being ignorant on purpose.
They closed my issue #12223 because bullshit

[panva]

I have provided all the log data, there is no way to inspect the response, do you see the content of the response from the provided log data? I don't.

Logs and the actual objects they represent may differ. The OperationProcessingError instance does have a cause property of its own that, once you programatically get to the error, can be inspected. There's no need to get salty and certainly no reason to be rude when people try to help you.

[idc77]

Salty? Go fuck yourself. You're bullshiting all around providing ZERO value. I don't need your "help". Fuck off

[panva]

That's rude.

[idc77]

Downgraded for v4:

 GET /api/auth/error?error=OAuthCallback 302 in 3ms
 GET /api/auth/signin?error=OAuthCallback 200 in 2ms
 POST /api/auth/signin/keycloak 302 in 430ms
[next-auth][error][OAUTH_CALLBACK_ERROR] 
https://next-auth.js.org/errors#oauth_callback_error expected 200 OK, got: 301 Moved Permanently {
  error: OPError: expected 200 OK, got: 301 Moved Permanently
      at processResponse (webpack-internal:///(rsc)/./node_modules/.pnpm/openid-client@5.7.0/node_modules/openid-client/lib/helpers/process_response.js:41:11)
      at Client.grant (webpack-internal:///(rsc)/./node_modules/.pnpm/openid-client@5.7.0/node_modules/openid-client/lib/client.js:1220:28)
      at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
      at async Client.callback (webpack-internal:///(rsc)/./node_modules/.pnpm/openid-client@5.7.0/node_modules/openid-client/lib/client.js:432:30)
      at async oAuthCallback (webpack-internal:///(rsc)/./node_modules/.pnpm/next-auth@4.24.10_next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1__react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next-auth/core/lib/oauth/callback.js:94:16)
      at async Object.callback (webpack-internal:///(rsc)/./node_modules/.pnpm/next-auth@4.24.10_next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1__react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next-auth/core/routes/callback.js:45:11)
      at async AuthHandler (webpack-internal:///(rsc)/./node_modules/.pnpm/next-auth@4.24.10_next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1__react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next-auth/core/index.js:175:28)
      at async NextAuthRouteHandler (webpack-internal:///(rsc)/./node_modules/.pnpm/next-auth@4.24.10_next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1__react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next-auth/next/index.js:57:28)
      at async NextAuth._args$ (webpack-internal:///(rsc)/./node_modules/.pnpm/next-auth@4.24.10_next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1__react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next-auth/next/index.js:89:16)
      at async /home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:55753
      at async eO.execute (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:46523)
      at async eO.handle (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/compiled/next-server/app-route.runtime.dev.js:6:57007)
      at async doRender (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:1359:42)
      at async cacheEntry.responseCache.get.routeKind (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:1569:40)
      at async DevServer.renderToResponseWithComponentsImpl (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:1489:28)
      at async DevServer.renderPageComponent (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:1920:24)
      at async DevServer.renderToResponseImpl (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:1958:32)
      at async DevServer.pipeImpl (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:917:25)
      at async NextNodeServer.handleCatchallRenderRequest (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/next-server.js:272:17)
      at async DevServer.handleRequestImpl (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/base-server.js:813:17)
      at async /home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/dev/next-dev-server.js:339:20
      at async Span.traceAsyncFn (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/trace/trace.js:154:20)
      at async DevServer.handleRequest (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/dev/next-dev-server.js:336:24)
      at async invokeRender (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/lib/router-server.js:173:21)
      at async handleRequest (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/lib/router-server.js:350:24)
      at async requestHandlerImpl (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/lib/router-server.js:374:13)
      at async Server.requestListener (/home/darko/WebstormProjects/nextjs/cooksbooks/node_modules/.pnpm/next@14.2.10_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/next/dist/server/lib/start-server.js:141:13) {
    name: 'OAuthCallbackError',
    code: undefined
  },
  providerId: 'keycloak',
  message: 'expected 200 OK, got: 301 Moved Permanently'
}

next-auth is a POS