Unable to set Referrer-Policy HTTP header using the Angular HTTP client

Bug Report

Affected Package

The issue is caused by package @angular/common/http

Is this a regression?

Unknown. Most likely not.

Description

Is not possible to change the Referrer-Policy HTTP header using the Angular HTTP client.

Minimal Reproduction

See https://stackblitz.com/edit/angular-ivy-abg9st?file=src%2Fapp%2Fapp.component.ts or see code snippet below:

const url = `https://jsonplaceholder.typicode.com/todos/1`;

return this.httpClient.get(url, {
  headers: new HttpHeaders({
    'Referrer-Policy': 'no-referrer'
  })
});

Exception or Error

The Referer and Referrer-Policy HTTP headers are unchanged.

We expect the Referer header to be hidden and Referrer Policy to be no-referrer

Expected:

Referrer Policy: no-referrer

Actual:

Referrer Policy: origin-when-cross-origin

Your Environment

Angular Version:

Angular CLI: 11.2.6
Node: 14.15.4
OS: darwin x64

Angular: 11.2.7
... animations, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, platform-server, router
Ivy Workspace: Yes

Package                          Version
----------------------------------------------------------
@angular-devkit/architect        0.1102.6
@angular-devkit/build-angular    0.1102.6
@angular-devkit/core             11.2.6
@angular-devkit/schematics       11.2.6
@angular-devkit/schematics-cli   0.1102.6
@angular/cdk                     11.2.6
@angular/cli                     11.2.6
@angular/fire                    6.1.4
@angular/flex-layout             11.0.0-beta.33
@angular/material                11.2.6
@nguniversal/builders            11.2.1
@nguniversal/express-engine      11.2.1
@schematics/angular              11.2.6
@schematics/update               0.1102.6
ng-packagr                       11.2.4
rxjs                             6.6.7
typescript                       4.1.5

Anything else relevant?

The issue persists across browsers.

[angular-robot[bot]]

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