阿里云是否支持WebSocket？

服务器:Tomcat8，javax.websocket-api
使用JS连接websocket，提示不可以。


难道是服务器的配置问题？
js：
_Socket.initialize = function() {
        if (window.location.protocol == 'http:') {
            _Socket.connect('ws://' + window.location.host + '/socket/receiver');
        } else {
           _Socket.connect('wss://' + window.location.host + '/socket/receiver');
        }
    };chart.js:16 WebSocket connection to 'ws://xxx.xxx.xxx.xxx:18080/axxx.xxx.xxx.xsocket/receiver' failed: Error during WebSocket handshake: Unexpected response code: 404