I am trying to send the Session Id of an ASP.NET Core 5 application using Razor Pages to my SignalR Core Hub. However, the Session Id is only added to the negotiate request, not to the actual WebSocket that is being opened:

How can I add it to the sessionsHub request as well, which is used by the OnConnected() method in the hub?

The Razor Page .cs:

public class IndexModel : PageModel
{
    private readonly HttpContext _httpContext;
    public string SessionId { get; set; }
    public IndexModel(IHttpContextAccessor httpContextAccessor)
    {

        _httpContext = httpContextAccessor.HttpContext;
    }
    public async Task OnGet()
    {
        SessionId = _httpContext.Session.Id;
    }
}

The .cshtml using a querystring, I've also tried adding a Session-Id as Header to the request, same result:

@page
@model IndexModel
<script type="text/javascript">
    var sessionId = "@Model.SessionId";
class CustomHttpClient extends signalR.DefaultHttpClient {
    send(request) {
        var url = new URL(request.url);
        if(!url.search){
            url.href = url.href   '?sessionId="'   sessionId   '"';
        }else{
            url.href = url.href   '&sessionId="'   sessionId   '"';
        }
        request.url = url.href;
        return super.send(request);
    }
}
var connection = new signalR.HubConnectionBuilder().withUrl("/sessionsHub", { httpClient: new CustomHttpClient() }).build();
connection.start().then(() => {
}).catch(function (err) {
    return console.error(err.toString());
});
</script>

The hub:

public class SessionHub : Hub{

    public override async Task OnConnectedAsync()
    {
        await base.OnConnectedAsync();
            
        string sessionId = GetSessionId();
    }

    private string GetSessionId()
    {
        HttpContext httpContext = Context.GetHttpContext();
        List<StringValues> sessionIdQueryString = httpContext.Request.Query.Where(x => x.Key == "sessionId").Select(x => x.Value).ToList();
        if (sessionIdQueryString.Count == 0)
        {
            throw new NullReferenceException();
        }

        string sessionId = sessionIdQueryString.First();
        
return sessionId;
    }
}

CodePudding user response：

You need to enter the sessionid value inside the url when creating the connetion. so that it can be accessed in all hub methods The code will look like this :

var connection = new signalR.HubConnectionBuilder()
        .withUrl("/sessionsHub/[email protected]")
        .build();

       connection.start().then(function(){
       //ToDo
        }).catch(function (err) {
        console.log(err);
       });