var request = plugins.rest_ws.getRequest();
var contents = request.getContents();
if (contents.length > 0) {
   var bytes = contents[0].getBytes();
}

var request = plugins.rest_ws.getRequest();
var contents = request.getContents();
if (contents.length > 0) {
   var contentType = contents[0].getContentType();
}

var request = plugins.rest_ws.getRequest();
var contents = request.getContents();
if (contents.length > 0) {
   var fieldName = contents[0].getFieldName();
}

var request = plugins.rest_ws.getRequest();
var contents = request.getContents();
if (contents.length > 0) {
   var name = contents[0].getName();
}

var request = plugins.rest_ws.getRequest();
var contents = request.getContents();
if (contents.length > 0) {
   var size = contents[0].getSize();
}

var request = plugins.rest_ws.getRequest();
var contents = request.getContents();
if (contents.length > 0) {
   var string = contents[0].getString('UTF-8');
}