Confusing requests about enforced Spring Security managed authentication module and API routes

[busybox11]

I'm currently trying to interface a custom-made module that utilizes Spring Security for authentication, as part of a custom OAuth2 solution.

It is internally exposing a /login route on the server via a RestController, using @GetMapping inside the module. If this can help you, it extends AbstractAuthenticationProcessingFilter somewhere with the parameter "/login".

My problem is that I can't seem to be able to access this method from the 8080 port that exposes both the API and the Angular front-end. I am forced to use a /login GET callback for OAuth by the module, but everytime I try to use it I am redirected to the frontend, NOT the backend.

Getting the base URL via the provided applicationConfigService.getEndpointFor method still redirects to the same base /login URL, and it is still served by Angular.

This is probably very simple - I just got introduced to the project using JHipster. Though I did read all the documentation multiple times, this could indicate a need for more clarifications in the documentation. If it is the case, I apologize for the confusion.

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EDIT: It looks like it could be related to this issue: #22843