asp.net core websockets example via controller

WSController.cs

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.Net.WebSockets;

namespace WebAPI.Controllers
{
    [Route("/ws")]
    [ApiController]
    public class WSController : ControllerBase
    {
        [HttpGet]
        [AllowAnonymous]
        public async Task Get()
        {
            if(HttpContext.WebSockets.IsWebSocketRequest)
            {
                using var webSocket = await HttpContext.WebSockets.AcceptWebSocketAsync(new WebSocketAcceptContext()
                {
                    DangerousEnableCompression = true,
                });
                await Echo(webSocket);
            }
            else
            {
                HttpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
            }
        }

        private async Task Echo(WebSocket webSocket)
        {
            var buffer = new byte[1024 * 4];

            WebSocketReceiveResult receiveResult;
            while (true)
            {
                //Wait request
                receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);

                if (receiveResult.CloseStatus.HasValue)
                    break;

                //Echo
                await webSocket.SendAsync(new ArraySegment<byte>(buffer, 0, receiveResult.Count),
                    receiveResult.MessageType,
                    receiveResult.EndOfMessage,
                    CancellationToken.None);
            }

            await webSocket.CloseAsync(receiveResult.CloseStatus.Value, receiveResult.CloseStatusDescription, CancellationToken.None);
        }
    }
}