Angular4 HttpClient don't send my cookies

i use HttpClient for a CORS post request from "example.fr" to "api.example.fr".

I receive the correct value from my REST API Server :

Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:content-type
Access-Control-Allow-Methods:POST, GET, DELETE, PUT, OPTIONS
Access-Control-Allow-Origin:http://example.fr
Access-Control-Max-Age:3600

But I need to send my Cookies to api.example but that doesn't work.

I am calling post method like:

return this.http.post(Config.ROUTES.auth.register, user, { withCredentials: true, })
      .catch(Utils.handleError);

Can someone help me please ? Thanks a lot.