# SignalR ## SignalR Attributes SignalR attributes | Attribute | Type | Description | Examples | Stability | |---|---|---|---|---| | `signalr.connection.status` | string | SignalR HTTP connection closure status. | `app_shutdown`; `timeout` |  | | `signalr.transport` | string | [SignalR transport type](https://github.com/dotnet/aspnetcore/blob/main/src/SignalR/docs/specs/TransportProtocols.md) | `web_sockets`; `long_polling` |  | `signalr.connection.status` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | |---|---|---| | `app_shutdown` | The connection was closed because the app is shutting down. |  | | `normal_closure` | The connection was closed normally. |  | | `timeout` | The connection was closed due to a timeout. |  | `signalr.transport` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | |---|---|---| | `long_polling` | LongPolling protocol |  | | `server_sent_events` | ServerSentEvents protocol |  | | `web_sockets` | WebSockets protocol |  |