Ardalis 8 file download

[heyder777]

Hi. My project is in ardalis 8.
When I try to download the file, I get the following error.
I am open to all suggestions.

public class Download(IMediator _mediator, IFileService _fileService) : Endpoint<DownloadCommentRequest, FileStreamResult>
{

    public override void Configure()
    {
        Post(DownloadCommentRequest.Route);
        AllowAnonymous();
        Summary(s =>
        {
            s.Summary = "Create a new Comment.";
            s.Description = "Create a new Comment. A valid loginId and data required.";
            s.ExampleRequest = new DownloadCommentRequest { LoginId = "AB123456", Date = "2024-12-12", FileId = 15 };
        });
    }


public override async Task HandleAsync(DownloadCommentRequest request, CancellationToken cancellationToken)
    {
        var result = await _mediator.Send(new DownloadCommentCommand(request.LoginId, request.Date!, request.FileId),
            cancellationToken);

        if (result.IsSuccess)
        {
            var filePath = Path.Combine(result.Value.Path!, result.Value.FileName!);
            bool exists = _fileService.FileExists(filePath);
            if (!exists) throw new ApiException(MagicStrings.FileNotExist, (int)System.Net.HttpStatusCode.NotFound);
            var stream = File.OpenRead(filePath);

            Response = new FileStreamResult(stream, new MediaTypeHeaderValue("application/octet-stream"))
            {
                FileDownloadName = result.Value.FileOriginalName
            };
        }
    }
}

Error:

System.InvalidOperationException: Timeouts are not supported on this stream.
at System.IO.Stream.get_ReadTimeout()
at ReadTimeoutGetter(Object)
at System.Text.Json.Serialization.Metadata.JsonPropertyInfo1.GetMemberAndWriteJson(Object obj, WriteStack& state, Utf8JsonWriter writer) at System.Text.Json.Serialization.Converters.ObjectDefaultConverter1.OnTryWrite(Utf8JsonWriter writer, T value, JsonSerializerOptions options, WriteStack& state)
at System.Text.Json.Serialization.JsonConverter1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state) at System.Text.Json.Serialization.Metadata.JsonPropertyInfo1.GetMemberAndWriteJson(Object obj, WriteStack& state, Utf8JsonWriter writer)
at System.Text.Json.Serialization.Converters.ObjectDefaultConverter1.OnTryWrite(Utf8JsonWriter writer, T value, JsonSerializerOptions options, WriteStack& state) at System.Text.Json.Serialization.JsonConverter1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
at System.Text.Json.Serialization.JsonConverter1.WriteCore(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state) at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.SerializeAsync(Stream utf8Json, T rootValue, CancellationToken cancellationToken, Object rootValueBoxed)
at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.SerializeAsync(Stream utf8Json, T rootValue, CancellationToken cancellationToken, Object rootValueBoxed) at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.SerializeAsync(Stream utf8Json, T rootValue, CancellationToken cancellationToken, Object rootValueBoxed)
at FastEndpoints.Endpoint2.ExecAsync(CancellationToken ct) at FastEndpoints.Endpoint2.ExecAsync(CancellationToken ct)
at NSwag.AspNetCore.Middlewares.SwaggerUiIndexMiddleware.Invoke(HttpContext context)
at NSwag.AspNetCore.Middlewares.RedirectToIndexMiddleware.Invoke(HttpContext context)
at NSwag.AspNetCore.Middlewares.OpenApiDocumentMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at AutoWrapper.Base.WrapperBase.InvokeAsyncBase(HttpContext context, AutoWrapperMembers awm)
at AutoWrapper.AutoWrapperMiddleware.InvokeAsync(HttpContext context)
at Ardalis.ListStartupServices.ShowAllServicesMiddleware.Invoke(HttpContext httpContext)