RequestBuilder emailValidRequest =
new RequestBuilder( RequestBuilder.GET, contextURL + "api/emailconfig/isValid" );
emailValidRequest.setHeader( "If-Modified-Since", "01 Jan 1970 00:00:00 GMT" );
emailValidRequest.setHeader( "accept", "text/plain" );
try {
emailValidRequest.sendRequest( null, new RequestCallback() {
public void onError( Request request, Throwable exception ) {
MessageDialogBox dialogBox =
new MessageDialogBox( Messages.getString( "error" ), exception.toString(), false, false, true ); //$NON-NLS-1$
dialogBox.center();