curl and proxy

[AntonSotov via Digitalmars-d-learn]

   auto http = HTTP("dlang.org");
   http.onReceive = (ubyte[] data)
   {
     writeln(cast(string) (data));
     return data.length;
   };
   http.proxy = "192.168.111.111";
   http.proxyPort = 1788;

   WHAT HERE ?

   http.perform();
   //////////////////////////////////
how to make Сurl authorize on a proxy.
I specify proxyUser and proxyPassword?