POSTMESSAGE with RestDataSource

[lujop]

If I create a RestDataSource and I specify POSTMESSAGE data protocol in this way:

  RestDataSource dataSource = new RestDataSource();
  dataSource.setDataFormat(DSDataFormat.JSON);
  dataSource.setDataProtocol(DSProtocol.POSTMESSAGE);
  dataSource.setPrettyPrintJSON(Boolean.TRUE);
  dataSource.setSendMetaData(Boolean.TRUE);

POSTMESSAGE is completely ignored and the data is sent by get/post params.

To be able to receive the data as a message I've to override all the operation bindings with

dataSource.setOperationBindings(...);

. Then it works but I don't know why I've to override. I understand that operations has more preference about default setting. But I've been looking at the code of RestDataSource/DataSource and I don't see in any place where it define special operationbindings.

Some one can help me to understand this or point to what source code to look?

A lot of thanks in advance,

SmartGWT Version:smartgwt-2.2