Problem using proxy with primus client side

[Bojack92160]

I'm trying to connect with primus through a proxy. For that, I use the transport option like this:

      transport: { 
        agent: new HttpsProxyAgent(url.parse('http://Username:Pswd@IP:Port')),
        extraHeaders: {}
        forceNode: true,
      },
      strategy: "disconnect,timeout",
      reconnect: {
        max: 5000,
        min: 500,
        retries: 10
      }
    }

let primus = new Primus(Myurl, module);

Primus doesn't use my proxy and connect directly with my own IP adress.