ASP.NET Core SignalR clients

Versioning, support, and compatibility

The SignalR clients ship alongside the server components and are versioned to match. Any supported client can safely connect to any supported server, and any compatibility issues would be considered bugs to be fixed. SignalR clients are supported in the same support lifecycle as the rest of .NET Core. See the .NET Core Support Policy for details.

Many features require a compatible client and server. See below for a table showing the minimum versions for various features.

The 1.x versions of SignalR map to the 2.1 and 2.2 .NET Core releases and have the same lifetime. For version 3.x and above, the SignalR version exactly matches the rest of .NET and has the same support lifecycle.

SignalR version .NET Core version Support level End of support
1.0.x 2.1.x Long Term Support August 21, 2021
1.1.x 2.2.x End Of Life December 23, 2019
3.x or higher same as SignalR version See the the .NET Core Support Policy

NOTE: In ASP.NET Core 3.0, the JavaScript client moved to the @microsoft/signalr npm package.

Feature distribution

The table below shows the features and support for the clients that offer real-time support. For each feature, the minimum version supporting this feature is listed. If no version is listed, the feature isn't supported.

Feature Server .NET client JavaScript client Java client
Azure SignalR Service Support 2.1.0 1.0.0 1.0.0 1.0.0
Server-to-client Streaming 2.1.0 1.0.0 1.0.0 1.0.0
Client-to-server Streaming 3.0.0 3.0.0 3.0.0 3.0.0
Automatic Reconnection (.NET, JavaScript) 3.0.0 3.0.0 3.0.0
WebSockets Transport 2.1.0 1.0.0 1.0.0 1.0.0
Server-Sent Events Transport 2.1.0 1.0.0 1.0.0
Long Polling Transport 2.1.0 1.0.0 1.0.0 3.0.0
JSON Hub Protocol 2.1.0 1.0.0 1.0.0 1.0.0
MessagePack Hub Protocol 2.1.0 1.0.0 1.0.0

Support for enabling additional client features is tracked in our issue tracker.

Additional resources