Asp.Net WebAPI WebSockets in self host mode not working

Question

basically I'm trying to do web-sockets in webapi in a self-host manner.

Here's an example:

class SomeController : ApiController
{
    public HttpResponseMessage SomeAction()
    {
        if (HttpContext.Current.IsWebSocketRequest)
        {
            HttpContext.Current.AcceptWebSocketRequest(new SomeSocketHandler());
            return Request.CreateResponse(HttpStatusCode.SwitchingProtocols);
        }
        else
        {
            return Request.CreateResponse(HttpStatusCode.BadRequest);
        }
    }
}

The problem is that HttpContext.Current is always null. It only exists when hosting through IIS.

My question is how can I do self-hosted web sockets using webapi if I can't get the current context.

Thanks.