Swift get xml from url, passing paramters

I am trying to access a personally hosted web service that passes back XML output but only if valid user credentials are passed along with the request.

Say for example something like this

<?php 
   check_cred($_POST["uname"], $_POST["key"]);

If everything is good it will hand back XML. But Im not sure how to pass along the username and key in the Swift

    func startConnection(){
      // Add user information to send to example.com here?
      var url = NSURL(string: "http://example.com/")
      var xmlParser = NSXMLParser(contentsOfURL: url)
      xmlParser?.delegate = self
      xmlParser?.parse()

   }
   func parser(parser: NSXMLParser!, didStartElement elementName: String!, namespaceURI: String!, qualifiedName qName: String!, attributes attributeDict: NSDictionary!) {
     println("Element's name is \(elementName)")
     songList.append(elementName)
     tableView.reloadData()
   }

If anyone knows a better method for doing something like this that would be smarter than my current approach, I'd be happy to hear that as well. Basically the idea is to hit a url, get a list of song titles-artists and toss it into a table view.