OIDC Dev UI screen is blank after the user authentication

[sberyozkin]

Describe the bug

OIDC Dev UI screen is blank after the user authenticates to Keycloak and is redirected back to Dev UI.

I confirmed Quarkus 3.8.2 is OK, fails starting from 3.9.0 and on main

See https://stackoverflow.com/questions/78270560/quarkus-oidc-keycloak-provider-leads-to-a-blank-screen

Expected behavior

No response

Actual behavior

No response

How to Reproduce?

Remove the quarkus.keycloak.devservices.grant.type=client property in this quickstart and do mvn quarkus:dev and then in Dev UI, choose the OIDC card, login to Keycloak as alice:alice

Output of uname -a or ver

No response

Output of java -version

No response

Quarkus version or git rev

No response

Build tool (ie. output of mvnw --version or gradlew --version)

No response

Additional information

No response

[quarkus-bot]

/cc @cescoffier (devui), @pedroigor (oidc), @phillip-kruger (devui)

[sberyozkin]

@phillip-kruger and also @michalvavrik, I don't see anything related in the devservices related quarkus-oidc extension code, something else is impacting how the OIDC DevUI SPA is displayed after the redirect to it from Keycloak.

FYI, redirect_uri is http://localhost:8080/q/dev-ui/io.quarkus.quarkus-oidc/keycloak-provider

[sberyozkin]

Confirmed, http://localhost:8080/q/dev-ui/io.quarkus.quarkus-oidc/keycloak-provider gives a blank screen

[sberyozkin]

It is shown correctly if you go to DevUI, and select the OIDC card and click on Keycloak Provider but if you access it directly as http://localhost:8080/q/dev-ui/io.quarkus.quarkus-oidc/keycloak-provider, it is blank

[phillip-kruger]

Are there any error in the browser console?

[sberyozkin]

@phillip-kruger I've just retried, with 3.9.0, all is clear. It looks like it is about the http://localhost:8080/q/dev-ui/io.quarkus.quarkus-oidc/keycloak-provider endpoint being available only if it is manually linked to from the DevUI/OpenID Connect/Keycloak Provider sequence, but on the redirect back to it, or if you just try to invoke it directly in the browser, it shows nothing.

FYI, in 3.8.2, if I open http://localhost:8080/q/dev-ui/io.quarkus.quarkus-oidc/keycloak-provider, it shows me an initial OIDC DevUI SPA screen correctly