file returning from webApi with gibberish characters

Question

receiving file from webApi with gibberish characters when file contains characters in different language.

I tried setting encoding on header but not helping. Please advise.

 

var dataBytes = File.ReadAllBytes(result.ReturnValue.ToString());

string fileName = Path.GetFileName(result.ReturnValue.ToString());

var dataStream = new MemoryStream(dataBytes);

HttpResponseMessage httpResponseMessage = new HttpResponseMessage(HttpStatusCode.OK);

httpResponseMessage.Content = new StreamContent(dataStream);

httpResponseMessage.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");

httpResponseMessage.Content.Headers.ContentDisposition.FileName = fileName;

httpResponseMessage.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");

httpResponseMessage.Content.Headers.Add("Access-Control-Expose-Headers", "Content-Disposition");

//httpResponseMessage.Content.Headers.Add("Content-Transfer-Encoding", "utf-8");

//httpResponseMessage.Content.Headers.Add("charset", Encoding.ASCII.ToString());

//httpResponseMessage.Content.Headers.Add("charset", "utf-8");

//httpResponseMessage.Content.Headers.ContentEncoding.Add("gzip");

httpResponseMessage.Content.Headers.ContentEncoding.Add("utf-8");

return httpResponseMessage;