private String generateLocationsRequestXML() {
TestOnDemandLocationsRequest locationsRequest = TestOnDemandLocationsRequestDocumentConfig.Factory.newInstance()
.addNewTestOnDemandLocationsRequest();
Request request = locationsRequest.addNewRequest();
request.setApiVersion(API_VERSION);
TestOnDemandHeaderConfig header = request.addNewHeader();
header.setUserAgent(USER_AGENT);