How Can I Connect To A Local WebSocket Server with Uno Platform WebAssembly - uno-platform

Question

The following code works with UWP but not WASM. I do have the Uno.Wasm.WebSockets package installed on the WASM head.
_webSocketConnectionCTS = new CancellationTokenSource();
using (_webSocket = new ClientWebSocket())
{
try
{
await _webSocket.ConnectAsync(new Uri(address), _webSocketConnectionCTS.Token);
await Receive(_webSocket, _webSocketConnectionCTS.Token);
}
catch (Exception ex)
{
Console.WriteLine("Failed to connect to WebSocket server: " + ex.Message);
}
}
The exception is thrown on the connect: "Value cannot be null" but neither parameter is null.

Answer 1

The ClientWebSocket class is not available in current builds of Uno, as the underlying class is not providing an implementation for it. You can use the Uno.Wasm.WebSockets package instead, which uses the same APIs as ClientWebSocket.
Here's an example from the documentation:
var ws = new Uno.Wasm.WebSockets.WasmWebSocket();
// Connect to a simple echo WebSocket server
await ws.ConnectAsync(new Uri("wss://echo.websocket.org"), CancellationToken.None);
Console.WriteLine("Program: Connected!");
// Send some data
var data = new ArraySegment<byte>(Encoding.UTF8.GetBytes("Hello websocket !"));
await ws.SendAsync(data, System.Net.WebSockets.WebSocketMessageType.Binary, false, CancellationToken.None);
Console.WriteLine("Program: Sent!");
// Read the echo back
var buffer = new byte[1024];
var received = await ws.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
var receivedString = Encoding.UTF8.GetString(buffer, 0, received.Count);
Console.WriteLine($"Received {received.Count} bytes: {receivedString}");