SSR causes 302 redirects to normalized URL

[kon72]

Command

serve

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

Previously someone pointed out that SSR causes lots of 302 redirects (#31881).
The fix landed in #31883 but we are still facing the similar issue for other URL patterns.
I expect that Angular server returns 200 OK and then URL normalization happens solely on the client side.

• /?empty redirects to /?empty=
• /?scope=email+profile redirects to /?scope=email%20profile
• /?bbb=1&aaa=2&bbb=3 redirects to /?bbb=1&bbb=3&aaa=2
• //foo redirects to /foo

Minimal Reproduction

ng serve and access to URLs above

export const serverRoutes: ServerRoute[] = [
  {
    path: '**',
    renderMode: RenderMode.Server,
  },
];

Exception or Error

Your Environment

Angular CLI       : 21.2.8
Angular           : 21.2.10
Node.js           : 24.15.0
Package Manager   : pnpm 10.26.1
Operating System  : darwin arm64

┌───────────────────────────┬───────────────────┬───────────────────┐
│ Package                   │ Installed Version │ Requested Version │
├───────────────────────────┼───────────────────┼───────────────────┤
│ @angular/build            │ 21.2.8            │ ^21.2.8           │
│ @angular/cdk              │ 21.2.8            │ ^21.2.8           │
│ @angular/cli              │ 21.2.8            │ ^21.2.8           │
│ @angular/common           │ 21.2.10           │ ^21.2.10          │
│ @angular/compiler         │ 21.2.10           │ ^21.2.10          │
│ @angular/compiler-cli     │ 21.2.10           │ ^21.2.10          │
│ @angular/core             │ 21.2.10           │ ^21.2.10          │
│ @angular/forms            │ 21.2.10           │ ^21.2.10          │
│ @angular/material         │ 21.2.8            │ ^21.2.8           │
│ @angular/platform-browser │ 21.2.10           │ ^21.2.10          │
│ @angular/platform-server  │ 21.2.10           │ ^21.2.10          │
│ @angular/router           │ 21.2.10           │ ^21.2.10          │
│ @angular/ssr              │ 21.2.8            │ ^21.2.8           │
│ rxjs                      │ 7.8.2             │ ^7.8.2            │
│ typescript                │ 5.9.3             │ ^5.9.3            │
│ vitest                    │ 4.1.4             │ ^4.1.4            │
└───────────────────────────┴───────────────────┴───────────────────┘

Anything else relevant?

No response

[alan-agius4]

This seems like a bug but we'll need to look at a reproduction to find and fix the problem. Can you setup a minimal repro please?

You can read here why this is needed. A good way to make a minimal repro is to create a new app via ng new repro-app and adding the minimum possible code to show the problem. Then you can push this repository to github and link it here.

This might be related to your directory structure so its really important to get an accurate repro to diagnose this.

[kon72]

Hi @alan-agius4 ,

I created a minimal repro for this issue: https://github.com/kon72/angular-ssr-redirect-repro

npm i
npm run start

curl -I 'http://localhost:4200/?empty'
curl -I 'http://localhost:4200/?scope=email+profile'
curl -I 'http://localhost:4200/?bbb=1&aaa=2&bbb=3'
curl -I 'http://localhost:4200//foo'

All four requests should result in 302 redirect. (This is curl with HEAD method for brevity, but the same happens with browser requests.)