关闭时返回 websocket 状态码

Question

我有一个简单的 C# API

[HttpGet]
public async Task<IActionResult> Get()
{
    if (!HttpContext.WebSockets.IsWebSocketRequest)
        return BadRequest();

    var webSocket = await HttpContext.WebSockets.AcceptWebSocketAsync();
    await webSocket.CloseOutputAsync(WebSocketCloseStatus.InvalidMessageType, "test", CancellationToken.None);

    return new EmptyResult();
}