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why I can't download file in my AppService layer in abp?

See original GitHub issue

[HttpGet]
[DontWrapResult]
public async Task DownloadCertificateFile(string companyDLRef)
{
	var certificatePath = await SettingManager.GetSettingValueAsync(SettingKeyConstants.ExternalServices.Support.CertificatePath);
	var certificateFolder = HostingEnvironmentAccessor.MapPath(certificatePath);
	if (string.IsNullOrEmpty(companyDLRef) == false)
	{
		var allowedExtensions = new[] { ".jpeg", ".jpg", ".png", ".pdf" };
		var files = Directory
		.GetFiles(certificateFolder, companyDLRef + "*")
		.Where(file => allowedExtensions.Any(file.ToLower().EndsWith))
		.ToList();
		if (files.Any())
		{
		   var file = files.First();

			HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
			var fileStream = new FileStream(file, FileMode.Open);
			response.Content = new StreamContent(fileStream);
			response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
			response.Content.Headers.ContentDisposition.FileName = Path.GetFileName(file);
			response.Content.Headers.ContentType = HasPdfExtension(file)? new MediaTypeHeaderValue("application/pdf") : new MediaTypeHeaderValue("image/png");
			return response;
		}

	}
	return new HttpResponseMessage();
}

Result is a json data:

{
    "version": {
        "major": 1,
        "minor": 1,
        "build": -1,
        "revision": -1,
        "majorRevision": -1,
        "minorRevision": -1
    },
    "content": {
        "headers": [
            {
                "key": "Content-Disposition",
                "value": [
                    "attachment; filename=220006.jpg"
                ]
            },
            {
                "key": "Content-Type",
                "value": [
                    "image/png"
                ]
            }
        ]
    },
    "statusCode": 200,
    "reasonPhrase": "OK",
    "headers": [],
    "requestMessage": null,
    "isSuccessStatusCode": true
}