@Override public void handleRequestInternal( ServerHttpRequest request, ServerHttpResponse response, AbstractHttpSockJsSession sockJsSession) throws SockJsException { try { String callback = request.getQueryParams().getFirst("c"); if (!StringUtils.hasText(callback)) { response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR); response.getBody().write("\"callback\" parameter required".getBytes("UTF-8")); return; } } catch (Throwable t) { sockJsSession.tryCloseWithSockJsTransportError(t, CloseStatus.SERVER_ERROR); throw new SockJsTransportFailureException("Failed to send error", sockJsSession.getId(), t); } super.handleRequestInternal(request, response, sockJsSession); }