ionic serve --ssl does not work with angular 12

[iva2k]

Description: --ssl is broken with Angular 12

Steps to Reproduce:

ionic start myApp tabs --type=angular
ionic ssl generate
ionic serve --ssl

Output: Server starts, however, browser shows error 504

My ionic info:

Ionic:

   Ionic CLI                     : 6.16.3 (C:\nvm\v12.20.0\node_modules\@ionic\cli)
   Ionic Framework               : @ionic/angular 5.6.9
   @angular-devkit/build-angular : 12.0.5
   @angular-devkit/schematics    : 12.0.5
   @angular/cli                  : 12.0.5
   @ionic/angular-toolkit        : 4.0.0

Cordova:

   Cordova CLI       : not installed
   Cordova Platforms : not available
   Cordova Plugins   : not available

Utility:

   cordova-res : 0.15.3
   native-run  : 1.4.0

System:

   NodeJS : v12.20.0 (C:\nodejs\node.exe)
   npm    : 6.14.8
   OS     : Windows 10

Other Information:

Running ionic serve without --ssl runs ok.

$ng version
     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 12.0.5
Node: 12.20.0
Package Manager: npm 6.14.8
OS: win32 x64

Angular: 12.0.5
... cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1200.5
@angular-devkit/build-angular   12.0.5
@angular-devkit/core            12.0.5
@angular-devkit/schematics      12.0.5
@schematics/angular             12.0.5
rxjs                            6.6.7
typescript                      4.2.4

[iva2k]

Digging in I noticed that ng serve --http throws error (it used to be ok pre-12), but ng serve --ssl works.

So I tried:

ionic serve --ssl -- --ssl

... and, it works this way!

So it seems that Angular 12 changed --http to --ssl, but ionic CLI did not change how it calls ng.