@Override public void call() throws Exception { WebSocketUpgradeHandler handler = WebSocketUpgradeHandler.class.cast(future.getAsyncHandler()); Request request = future.getRequest(); HttpResponseStatus status = new NettyResponseStatus(future.getUri(), config, response, channel); HttpResponseHeaders responseHeaders = new NettyResponseHeaders(response.headers()); Realm realm = request.getRealm() != null ? request.getRealm() : config.getRealm(); if (exitAfterProcessingFilters(channel, future, handler, status, responseHeaders)) { return; } future.setHttpHeaders(response.headers()); if (exitAfterHandlingRedirect( channel, future, response, request, response.getStatus().code(), realm)) return; boolean validStatus = response.getStatus().equals(SWITCHING_PROTOCOLS); boolean validUpgrade = response.headers().get(HttpHeaders.Names.UPGRADE) != null; String connection = response.headers().get(HttpHeaders.Names.CONNECTION); if (connection == null) connection = response.headers().get(HttpHeaders.Names.CONNECTION.toLowerCase(Locale.ENGLISH)); boolean validConnection = HttpHeaders.Values.UPGRADE.equalsIgnoreCase(connection); boolean statusReceived = handler.onStatusReceived(status) == State.UPGRADE; if (!statusReceived) { try { handler.onCompleted(); } finally { future.done(); } return; } final boolean headerOK = handler.onHeadersReceived(responseHeaders) == State.CONTINUE; if (!headerOK || !validStatus || !validUpgrade || !validConnection) { requestSender.abort(channel, future, new IOException("Invalid handshake response")); return; } String accept = response.headers().get(HttpHeaders.Names.SEC_WEBSOCKET_ACCEPT); String key = getAcceptKey( future .getNettyRequest() .getHttpRequest() .headers() .get(HttpHeaders.Names.SEC_WEBSOCKET_KEY)); if (accept == null || !accept.equals(key)) { requestSender.abort( channel, future, new IOException( String.format("Invalid challenge. Actual: %s. Expected: %s", accept, key))); } channelManager.upgradePipelineForWebSockets(channel.pipeline()); invokeOnSucces(channel, handler); future.done(); // set back the future so the protocol gets notified of frames Channels.setAttribute(channel, future); }