ADO .net Data Service error 'undefined' is not a supported HTTP method in IE8

Question

Edit1:This error is caused by this bug and solved.

I am using ASP .net Ajax Library and their CDN.

The code is like this

var  dataContext;
Sys.require([Sys.scripts.Templates, Sys.scripts.DataContext], loadComplete);

function loadComplete(features) {
    //create a datacontext to adonet data service
  dataContext = $create(Sys.Data.AdoNetDataContext, { serviceUri: '/DataService.svc' });
dataContext.fetchData("Customers", 
                 { $top: 1 }, 
                  null, // Defaults to overwrite changes 
                  null, // Defaults to GET 
                  function customerFetchSuccess(customers) { 
                      // Do something with customers... 
                  }, 
                  function customerFetchFailure(error) { 
                      // Handle the error somehow... 
                  });
}

function save()
{
 dataContext.saveChanges();
}

Dataobject is loaded from ado .net dataservice. Once edit is done, save function is called and dataobject will submit to ado .net dataservice.

This code work perfectly in FireFox 3.5, Chrome 4 but not in IE8.

Request content from IE8 --batch_7680-f3ba-6314 Content-Type: multipart/mixed;boundary=changeset_cb5c-b53d-95fe

--changeset_cb5c-b53d-95fe Content-Type: application/http Content-Transfer-Encoding: binary

MERGE http://www.localhost:5550/DataService.svc/Customer%2849) HTTP/1.1 Host: www.localhost:5550 Accept: application/json Accept-Charset: utf-8 Content-Type: application/json;charset=utf-8

{"__metadata":{..}} --changeset_cb5c-b53d-95fe Content-Type: application/http Content-Transfer-Encoding: binary

undefined undefined HTTP/1.1 Host: www.localhost:5550 Accept: application/json Accept-Charset: utf-8

I have compared the difference between chrome4 and IE8. I have noticed that IE 8 create an extra line "undefined undefined HTTP/1." in request which cause error. Any help or suggestion is appreciated.