java - Websocket 连接上出现“Access-Control-Allow-Origin”错误

Question

我正在尝试从不同的域连接到我的 websocket。服务器位于 localhost:8098 上，客户端位于 localhost:8080 上。每次我尝试连接时都会收到“Access-Control-Allow-Origin”错误，我还添加了 .setAllowedOrigins("*")。

不确定缺少什么。

服务器

@Configuration
@EnableWebSocketMessageBroker
public class webSocketObjects implements WebSocketMessageBrokerConfigurer {

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/topic");
        config.setApplicationDestinationPrefixes("/app");

    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/ws/Object").setAllowedOrigins("*").withSockJS();


    }

客户端

<script>
    let stompClient=null;
    import Stomp from 'stompjs';
    import SockJS from 'sockjs-client'
    export default {
        name: "modal",
        props: ['node'],
        data() {
            return{
                bacnetObject: '',
                status: "disconnected"


        }
        },
        mounted() {
            this.bacnetObject = this.node;
        },
        methods: {
            connect: function(){
                const socket = new SockJS('http://localhost:8098/ws/Object');
                stompClient = Stomp.over(socket);
                stompClient.connect({
                }, function (frame) {
                    console.log('Connected: ' + frame);
                    stompClient.subscribe('/topic/user', console.log(String.body))

                })
    },
            disconnect: function () {
                stompClient.disconnect();
            }
    }
    }
</script>

我收到错误:

访问位于“http://localhost:8098/ws/Object/info?t=1571728150435”的 XMLHttpRequest '来自原点'http://localhost:8080 ' 已被 CORS 策略阻止:请求的资源上不存在“Access-Control-Allow-Origin” header 。

Answer 1

如果您使用凭据，根据 MDN 上的文档，* 将不起作用。尝试指定主机。

For requests without credentials, the literal value "*" can be specified, as a wildcard; the value tells browsers to allow requesting code from any origin to access the resource. Attempting to use the wildcard with credentials will result in an error.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin

另一方面，有时根据您的情况，您可能需要处理这些 header

Access-Control-Allow-Methods: POST, GET, OPTIONS
Access-Control-Allow-Headers: header1, header2 ...

https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Preflighted_requests