How to set proxy for Spring StandardWebSocketClient

I am trying to establish a WebSocket connection using Spring StandardWebSocketClient, but getting an error due to proxy settings as the server is running behind the proxy. Below is the code I am using.

StandardWebSocketClient aStandardWebSocketClient=new StandardWebSocketClient();
WebSocketConnectionManager manager = new WebSocketConnectionManager(aStandardWebSocketClient, new WebSockethandler(), aWebSockURL);

Able to make a rest call by setting proxy configuration successfully.

Is there any proxy configuration available for making StandardWebSocketClient connect to websocket server?

SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
InetSocketAddress address = new InetSocketAddress("proxyHost",8080);
Proxy proxy = new Proxy(Proxy.Type.HTTP,address);
factory.setProxy(proxy);
restTemplate.setRequestFactory(factory);

After Screening the sourcecode of the StandardWebSocketClient implementation I don't think that proxy settings are supported currently. However I was able to establish a wss connection via a proxy using jetty-libs in spring boot:

pom.xml

    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-client</artifactId>
        <version>9.4.7.v20170914</version>
    </dependency>

    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-http</artifactId>
        <version>9.4.7.v20170914</version>
    </dependency>

    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-io</artifactId>
        <version>9.4.7.v20170914</version>
    </dependency>

    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-util</artifactId>
        <version>9.4.7.v20170914</version>
    </dependency>

    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-xml</artifactId>
        <version>9.4.7.v20170914</version>
    </dependency>

    <dependency>
        <groupId>org.eclipse.jetty.websocket</groupId>
        <artifactId>websocket-api</artifactId>
        <version>9.4.7.v20170914</version>
    </dependency>

    <dependency>
        <groupId>org.eclipse.jetty.websocket</groupId>
        <artifactId>websocket-client</artifactId>
        <version>9.4.7.v20170914</version>
    </dependency>

    <dependency>
        <groupId>org.eclipse.jetty.websocket</groupId>
        <artifactId>websocket-common</artifactId>
        <version>9.4.7.v20170914</version>
    </dependency>

SpringBootJettyWSSclient.java

...
HttpClient httpClient = new HttpClient(new SslContextFactory());

// add proxy
if (this.proxyHost.trim().length() > 0) {
  ProxyConfiguration proxyConfig = httpClient.getProxyConfiguration();
  List<ProxyConfiguration.Proxy> proxies = proxyConfig.getProxies();
  HttpProxy proxy = new HttpProxy(this.proxyHost, Integer.parseInt(this.proxyPort));
  proxies.add(proxy);
}

// add proxy auth
if (this.proxyUser.trim().length() > 0) {
  String fullProxy = "http://" + this.proxyUser + ":" + this.proxyPassword + "@" + this.proxyHost + ":" + this.proxyPort;
  AuthenticationStore authenticationStore = httpClient.getAuthenticationStore();
  URI uri = URI.create(fullProxy);
  authenticationStore.addAuthentication(new BasicAuthentication(uri, Authentication.ANY_REALM, this.proxyUser, this.proxyPassword));
}

httpClient.start();

WebSocketClient client = new WebSocketClient(httpClient);

client.start();
client.connect(new MyListener(), new URI(this.wssURL));
socket.awaitClose(50, TimeUnit.SECONDS);
...