WebSocketCloseStatus.cs

namespace System.Net.WebSockets
{
    public enum WebSocketCloseStatus
    {
        NormalClosure = 1000,
        EndpointUnavailable = 1001,
        ProtocolError = 1002,
        InvalidMessageType = 1003,
        Empty = 1005,
        InvalidPayloadData = 1007,
        PolicyViolation = 1008,
        MessageTooBig = 1009,
        MandatoryExtension = 1010,
        InternalServerError = 1011
    }
}