// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace Microsoft.AspNetCore.Http.Features;
 
/// <summary>
/// Provides access to server upgrade features.
/// </summary>
public interface IHttpUpgradeFeature
{
    /// <summary>
    /// Indicates if the server can upgrade this request to an opaque, bidirectional stream.
    /// </summary>
    bool IsUpgradableRequest { get; }
 
    /// <summary>
    /// Attempt to upgrade the request to an opaque, bidirectional stream. The response status code
    /// and headers need to be set before this is invoked. Check <see cref="IsUpgradableRequest"/>
    /// before invoking.
    /// </summary>
    /// <returns></returns>
    Task<Stream> UpgradeAsync();
}