Can't be set '/' proxy path in Angular17

[cipchk]

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

Angular start fails when setting a '/' proxy path.

Screenshot:

It looks like Angular returns the proxy data directly after startup, but in fact proxyConfig should only be for HttpClient.

Minimal Reproduction

1. Create new angular
2. Add proxy.conf.json config:

{
  "/": {
    "target": "http://localhost:9103/",
    "secure": false,
    "changeOrigin": true,
    "headers": { "Connection": "keep-alive" }
  }
}

3. Add "proxyConfig": "proxy.conf.json" in angular.json

"serve": {
  "configurations": {
        "development": {
+           "proxyConfig": "proxy.conf.json"
        }
  }
}

4. Update app.config.ts

import {
  APP_INITIALIZER,
  ApplicationConfig,
  Injectable,
  inject,
} from '@angular/core';
import { provideRouter } from '@angular/router';

import { routes } from './app.routes';
import { HttpClient, provideHttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({ providedIn: 'root' })
class StartupService {
  private http = inject(HttpClient);

  load(): Observable<any> {
    return this.http.get('/');
  }
}

export const appConfig: ApplicationConfig = {
  providers: [
    provideRouter(routes),
    provideHttpClient(),
    StartupService,
    {
      provide: APP_INITIALIZER,
      useFactory: (startupService: StartupService) => () =>
        startupService.load(),
      deps: [StartupService],
      multi: true,
    },
  ],
};

Exception or Error

No response

Your Environment

Angular CLI: 17.0.0
Node: 18.16.0
Package Manager: yarn 1.22.19
OS: darwin x64

Angular: 17.0.1
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1700.0
@angular-devkit/build-angular   17.0.0
@angular-devkit/core            17.0.0
@angular-devkit/schematics      17.0.0
@angular/cli                    17.0.0
@schematics/angular             17.0.0
rxjs                            7.8.1
typescript                      5.2.2
zone.js                         0.14.2

Anything else relevant?

No response

[JoostK]

It looks like Angular returns the proxy data directly after startup, but in fact proxyConfig should only be for HttpClient.

I don't know where this expectation comes from, but it does not align with my expectation. All traffic goes through the proxy server, so routing / to a different host will then cause all requests to be proxied as requested.

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