// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using System.Text;

namespace Microsoft.AspNetCore.Sockets.Features
{
    /// <summary>
    /// Indicates if the connection transport has an "inherent keep-alive", which means that the transport will automatically
    /// inform the client that it is still present.
    /// </summary>
    /// <remarks>
    /// The most common example of this feature is the Long Polling HTTP transport, which must (due to HTTP limitations) terminate
    /// each poll within a particular interval and return a signal indicating "the server is still here, but there is no data yet".
    /// This feature allows applications to add keep-alive functionality, but limit it only to transports that don't have some kind
    /// of inherent keep-alive.
    /// </remarks>
    public interface IConnectionInherentKeepAliveFeature
    {
        TimeSpan KeepAliveInterval { get; }
    }
}