Angular 20 with Jhipster

[leonnardosimoes]

I migrated a JHipster application from Angular 18 to 19 with no problems.
However, after upgrading to Angular 20, I started having issues with the proxy configuration.

The frontend runs on http://localhost:9000
, but when I start the app, it goes into an infinite redirect loop, and the Spring Boot backend (port 8080) doesn’t seem to correctly handle requests coming through the proxy.

Here’s my current proxy configuration file:

// proxy.conf.js

    function setupProxy({ tls }) {
      const conf = [
        {
          context: [
            '/api',
            '/services',
            '/management',
            '/swagger-resources',
            '/v2/api-docs',
            '/v3/api-docs',
            '/h2-console',
            '/oauth2',
            '/login',
            '/auth',
            '/health',
          ],
          target: `http${tls ? 's' : ''}://localhost:8080`,
          secure: false,
          changeOrigin: tls,
        },
      ];
      return conf;
    }
    
    module.exports = setupProxy;

The backend is a Spring Boot app (JHipster-generated).
Here’s a simplified application.yml configuration:

    server:
      port: 8080

With Angular 19, everything worked fine. After upgrading to Angular 20, the proxy no longer seems to forward requests correctly, and the frontend keeps reloading.

It looks like Spring Boot doesn’t recognize the proxy as before — maybe something changed in Angular CLI 20 or the dev server behavior.

Question:
Has something changed in Angular 20 that affects how the proxy works with Spring Boot or JHipster apps?
Do I need to update something in application.yml or change the proxy configuration to make it compatible?

Thanks!