Spring WebSocket Connecting with SockJS to a different domain

Question

WebSockets in Spring is a rather new topic that I;m tiring to find a bit more.

My problem is with connecting to a service from a different domain, I\'m working on with

Answer 1

To anyone getting to this ticket because of the 403 Forbidden answer when trying to connect through a SockJsClient to a different domain:

The problem arises when trying to make a GET to the /info Url, as part of the handshaking. The response actually returns a 200 via WGET as well as via browser. Only through SockJsClient it doesn't work.

After trying different solutions, the only one that really fixed the issue is to write a class that implements Transport and InfoReceiver. In this way the developer can directly handle this part of the handshake. Basically you make the work in the executeInfoRequest() method:

@Override
public String executeInfoRequest(URI infoUrl, HttpHeaders headers) {
    HttpGet getRequest = new HttpGet(infoUrl); // eventually add headers here
    HttpClient client = HttpClients.createDefault();

    try {
        HttpResponse response = client.execute(getRequest);
        List responseOutput = IOUtils.readLines(response.getEntity().getContent());

        return responseOutput.get(0);
    } catch (IOException ioe) {
        ...
    }
}

I defined TransportType.XHR as transport type.