WSRequest using HTTP Basic authentication with WSDL

Hi, I'd like to invoke remote service using WSRequest in WSDL mode, but the service requires HTTP Basic authentication.

Unfortunately, following code

var request = new WSRequest();
var options = new Array();
options["username"] = "myname";
options["password"] = "mypass";
request.openWSDL("http://url.to/the/service/wsdl",false, options);
request.send("operation",null);
return request.responseXML;

results in

Fault: Transport error: 401 Error: Authorization Required

Documentation of  "openWSDL" mentions, that username and password options are related to WS-Security (that is not used in this scenario). Probably, "open" function is able to use HTTP Basic authentication, but it lacks the benefits of using WSDL!

Is there any solution to invoke such service in WSDL mode? (I think, HTTP Basic auth is still widely used in many environments)