_contentType=_mimeTypes.getMimeByExtension(_resource.toString());
_lastModified=resource.lastModified(); if (_lastModified!=-1) _lastModifiedBytes=new ByteArrayBuffer(HttpFields.formatDate(_lastModified,false));
        Content(Resource resource)        {            _resource=resource;            _lastModified=resource.lastModified();            _next=this;            _prev=this;                        _contentType=_mimeTypes.getMimeByExtension(_resource.toString());        }