Angular AppEngine i18 redirect includes full domain

[jmbarbier]

Command

build

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

While serving a i18n using AngularNodeAppEngine, the base path i18n redirect uses the full URL to do the 302 redirect to i18n subpaths.

https://github.com/angular/angular-cli/blob/main/packages/angular/ssr/src/app-engine.ts#L120

If the application is not served directly on the real domain (ex: using a cdn or cloud run), the redirect issued is redirecting to the bad domain.

browser : example.com  ----> cdn/reverse proxy  ---> app.cloud.run.domain
                                                                |
                                                           redirect 302 to
   browser            <----------------------------  app.cloud.run.domain/de/
       |                                                         
handle redirect       ------------------------------> app.cloud.run.domain/de/

Only redirecting to /de/ path instead of full url should be enough.

Minimal Reproduction

Create a ssr i18n app
Host it on google cloud run (url : app.cloud.run.domain)
Point to it using any cdn/reverse proxy (url: example.com)
Navigate to naked domain example.com
Browser is redirected to app.cloud.run.domain/de

Exception or Error

Your Environment

Angular CLI: 19.1.4
Node: 22.6.0
Package Manager: npm 10.8.2
OS: linux x64

Angular: 19.1.3
... animations, common, compiler, compiler-cli, core, forms
... localize, platform-browser, platform-browser-dynamic
... platform-server, router, service-worker

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1901.4
@angular-devkit/build-angular   19.1.4
@angular-devkit/core            19.1.4
@angular-devkit/schematics      19.1.4
@angular/cli                    19.1.4
@angular/ssr                    19.1.4
@schematics/angular             19.1.4
rxjs                            7.8.1
typescript                      5.7.3

Anything else relevant?

No response

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