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

20.3.6

Description

In our app, we optionally use the X-Forwarded-Prefix header to configure the base href. This works correctly in version 20.3.6, but after upgrading to 20.3.7 (and in later versions including v21), we encounter a redirect loop when a custom base href is used. The issue does not occur when the default base href is used.

• domain.com – 200 OK
• domain.com/app – 302 Found (redirect loop)

Minimal Reproduction

https://github.com/pf-vkocib/angular-ssr-20.3.7-redirect-loop-reproduction

1. configure local nginx based on example-nginx.conf
2. npm install
3. npm run serve:ssr:ssr-redirect-loop
4. visit localhost/app

(v20.3.6 branch uses previous version and it is ok)

Exception or Error

ERR_TOO_MANY_REDIRECTS

Your Environment

Angular CLI: 20.3.7
Node: 20.19.2
Package Manager: npm 10.8.2
OS: darwin arm64
    

Angular: 20.3.13
... common, compiler, compiler-cli, core, forms
... platform-browser, platform-server, router

Package                      Version
------------------------------------
@angular-devkit/architect    0.2003.7
@angular-devkit/core         20.3.7
@angular-devkit/schematics   20.3.7
@angular/build               20.3.7
@angular/cli                 20.3.7
@angular/ssr                 20.3.7
@schematics/angular          20.3.7
rxjs                         7.8.2
typescript                   5.9.3
zone.js                      0.15.1

Anything else relevant?

No response