static async Task Main(string[] args) { var imagepath = @"oscar.jpg"; var urlAddress = @"http://localhost:6000/api/faces"; ImageUtility imageUtility = new ImageUtility(); var bytes = imageUtility.ConvertToBytes(imagepath); List <byte[]> faceList = null; var byteContent = new ByteArrayContent(bytes); byteContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream"); HttpClientHandler clientHandler = new HttpClientHandler(); clientHandler.ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => { return(true); }; using var httpClient = new HttpClient(clientHandler); using var response = await httpClient.PostAsync(urlAddress, byteContent); string apiResponse = await response.Content.ReadAsStringAsync(); faceList = JsonConvert.DeserializeObject <List <byte[]> >(apiResponse); if (faceList.Count == 0) { throw new Exception("Face Not Found"); } for (int i = 0; i < faceList.Count; i++) { imageUtility.FromBytesToImage(faceList[0], $"face{i}.jpg"); } Console.WriteLine($"{faceList.Count} Face(s) Detected."); }