CORS issues : Is service proxies still supported?

Hi,
I’m a bit lost. I have CORS issues trying to fetch API data from my development environment so I tried to add the built-in proxy (referenced everywhere) as such :

{
  "name": "my-app",
  "app_id": "",
  "proxies": [
    {
      "path": "/api",
      "proxyUrl": "http://myapi.com/api"
    }
  ]
}

But this doesn’t seems to work.

Is this still supported ? If not what are the alternatives ?

My config :

Ionic:

   Ionic CLI                     : 6.10.1 (/usr/local/lib/node_modules/@ionic/cli)
   Ionic Framework               : @ionic/angular 4.11.10
   @angular-devkit/build-angular : 0.801.3
   @angular-devkit/schematics    : 8.1.3
   @angular/cli                  : 8.1.3
   @ionic/angular-toolkit        : 2.0.0

Capacitor:

   Capacitor CLI   : 1.5.1
   @capacitor/core : 1.5.1

Cordova:

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

Utility:

   cordova-res (update available: 0.15.1) : 0.11.0
   native-run                             : not installed

System:

   Android SDK Tools : 26.1.1
   NodeJS            : v10.16.3 (/usr/bin/node)
   npm               : 6.9.0
   OS                : Linux 4.15