public void handle(HttpServletRequest request, HttpServletResponse response, HandlerChain chain) throws Exception {
final String graphVertexId = getAttributeString(request, "graphVertexId");
final String propertyName = getRequiredParameter(request, "propertyName");
final String propertyKey = getRequiredParameter(request, "propertyKey");
User user = getUser(request);
Authorizations authorizations = getAuthorizations(request, user);
String workspaceId = getActiveWorkspaceId(request);
Vertex graphVertex = graph.getVertex(graphVertexId, authorizations);
List<Property> properties = toList(graphVertex.getProperties(propertyKey, propertyName));