return doHead(target(graphName)) ;
}
private boolean doHead(String url)
{
HttpUriRequest httpHead = new HttpHead(url) ;
try {
HttpOp.execHttpHead(url, WebContent.defaultGraphAcceptHeader, noResponse, null, null, this.authenticator) ;
return true ;
} catch (HttpException ex) {
if ( ex.getResponseCode() == HttpSC.NOT_FOUND_404 )