Issue Overriding transformrequest to add httpheaders

Version: Smartgwt4.0

Browser: Mozilla Firefox

Server side: Spring Rest service in apache Tomcat

Issue:
I want to add the user credentials in the httpheaders which can be authenticated at the server side SecurityFilter.

To add the httpheader, I'm overriding the transformrequest method in the class extends RestDatasource. But when I set the httpheader to the dsRequest, my request is getting changed from POST to OPTIONS which is not able to be processed by my server side code.

Please see the Original request and Request after adding httpheader below. Can you please review and let me know what I'm doing wrong.

Version Smartgwt4.0

Original Request
------------------

Code:

POST http://127.0.0.1:8080/bom/roleaccesscombo?isc_dataFormat=json HTTP/1.1

Host: 127.0.0.1:8080

User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-US,en;q=0.5

Accept-Encoding: gzip, deflate

Content-Type: application/json; charset=UTF-8

Referer: http://127.0.0.1:8888/BillOfMaterialUI.html?gwt.codesvr=127.0.0.1:9997

Content-Length: 169

Origin: http://127.0.0.1:8888

Connection: keep-alive

Pragma: no-cache

Cache-Control: no-cache



{

    "dataSource":"RoleAccessComboDS", 

    "operationType":"fetch", 

    "data":{

        "loginID":"admin", 

        "password":"admin"

    }, 

    "oldValues":null

}

Overriding code:
-----------------

Code:

        @Override

        protected Object transformRequest(DSRequest dsRequest) {

                

                Map mapHeader =  dsRequest.getHttpHeaders();

                

                if (mapHeader == null) {

                        mapHeader = new HashMap();

                }

                byte[] b = null;

                b = "user:passwordt".getBytes();

                byte[] result = Base64.encode(b);

                String sendString = new String(result);



                mapHeader.put("authorization","Basic "+ sendString);



                dsRequest.setHttpHeaders(mapHeader);



                Object data = super.transformRequest(dsRequest);

                return data;

        }

After overriding the transformrequest to add the httpheaders
------------------------------------------------------------

Code:

OPTIONS http://127.0.0.1:8080/bom/roleaccesscombo?isc_dataFormat=json HTTP/1.1

Host: 127.0.0.1:8080

User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-US,en;q=0.5

Accept-Encoding: gzip, deflate

Origin: http://127.0.0.1:8888

Access-Control-Request-Method: POST

Access-Control-Request-Headers: authorization,content-type

Connection: keep-alive

Pragma: no-cache

Cache-Control: no-cache

Thanks
Thiruppathy.R