UseSignalR and UseConnections are marked obsolete

[ajaybhargavb]

UseSignalR and UseConnections are marked obsolete

The methods UseConnections and UseSignalR, and the classes ConnectionsRouteBuilder and HubRouteBuilder are being marked obsolete in 3.0.

Version introduced

3.0

Old behavior

SignalR hub routing was configured using UseSignalR, UseConnections.

New behavior

The old way of configuring routing has been obsoleted and replaced with Endpoint routing.

Reason for change

We're moving middleware to the new EndpointRouting system so we're obsoleting the old way of adding middleware.

Recommended action

Replace UseSignalR with UseEndpoints,

Old code:

app.UseSignalR(routes =>
{
    routes.MapHub<SomeHub>("/path");
});

New code:

app.UseEndpoints(endpoints =>
{
    endpoints.MapHub<SomeHub>("/path");
});

Category

ASP.NET Core

Affected APIs

Microsoft.AspNetCore.Builder.IApplicationBuilder.UseSignalR
Microsoft.AspNetCore.Builder.IApplicationBuilder.UseConnections
Microsoft.AspNetCore.Http.Connections.ConnectionsRouteBuilder
Microsoft.AspNetCore.SignalR.HubRouteBuilder

---

Issue metadata

• Issue type: breaking-change

[omuleanu]

using the obsolete code, my webapp works (netcoreapp3.1),
but as soon as I use the new way, in my case:
endpoints.MapHub<SyncHub>("/syncHub");
I get the error:

VM68:16 Uncaught (in promise) Error: Failed to invoke 'Send' due to an error on the server.
at _this.callbacks. (:16:35838)
at HubConnection.processIncomingData (:16:38004)
at WebSocketTransport.HubConnection.connection.onreceive (:16:27722)
at WebSocket.webSocket.onmessage (:16:110678)
_this.callbacks. @ VM68:16
HubConnection.processIncomingData @ VM68:16
HubConnection.connection.onreceive @ VM68:16
webSocket.onmessage @ VM68:16

when calling connection.invoke

[omuleanu]

turns out using the new endpoints.MapHub you have to send the exact parameter type you defined in the Hub,
I was sending: connection.invoke("Send", key) // key being int
and in the hub I have:
public async Task Send(string key)
so now I had to call toString() on key in js to make sure it is the same type as in the hub.