ASP.NET Core 6 Web API - ContentDisposition response header

Question

I FOUND THE SOLUTION!

public async Task<IAactionResult> Export(ExportType fileType)
{
    var result = await _someService.ExportAsync(fileType);

    var fileResult = new FileContentResult(result.Content,contentType)
            {
                FileDownloadName = result.FileName,
            };

    return fileResult;
}

I have an ExportResult class:

public class ExportResult
{
    public string FileName { get; set; } = null!;
    public byte[] Content { get; set; } = null!;
}

And I have an Export method in a controller:

public async Task<ExportResult> Export(ExportType fileType)
{
    var result = await _someService.ExportAsync(fileType);
    return result;
}

The problem is the content-disposition response header didn't show up.

I tried to add to cors with these, but it doesn't work.

.WithExposedHeaders("content-disposition");
.WithExposedHeaders("Content-Disposition");