Making an HTTP POST call with multipart/form-data using jQuery?-Collection of common programming errors

I’m trying to make a HTTP POST call with multipart/form-data , using jQuery:

$.ajax({
  url: 'http://localhost:8080/dcs/rest',
  type: 'POST',
  contentType:'multipart/form-data',
  data: 'dcs.source=boss-web&query=data&dcs.algorithm=lingo&dcs.output.format=JSON&dcs.clusters.only=true', 
  //dataType: "jsonP",
  success: function(jsonData) {alert('POST alert'); data=jsonData ; },
  error : function(XMLHttpRequest, textStatus, errorThrown) {
            console.log('An Ajax error was thrown.');
            console.log(XMLHttpRequest);
            console.log(textStatus);
            console.log(errorThrown);
          }
});

It doesn’t work. Firebug returns an undefined error and the returned XMLHttpRequst object multipart field is set to false.

What can i do to make this work with jQuery? And if it’s not possible is there a simple to achieve this?

i.e. idon’t need to transfer files , just some data. but the server requires multipart.