Wino-Mail/Wino.Core/Http/MicrosoftImmutableIdHandler.cs

using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;

namespace Wino.Core.Http;

/// <summary>
/// Adds additional Prefer header for immutable id support in the Graph service client.
/// </summary>
public class MicrosoftImmutableIdHandler : DelegatingHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        request.Headers.TryAddWithoutValidation("Prefer", "IdType=\"ImmutableId\"");

        return base.SendAsync(request, cancellationToken);
    }
}