static async Task Main(string[] args) { // begin - setup some sample data var bytaData = Encoding.UTF8.GetBytes("{\"Title\":\"A second book title\"}"); var failingByteData = Encoding.UTF8.GetBytes("{\"Title\":\"A second book title\""); // missing trailing brace var toProcess = new List <(ReadOnlyMemory <char>, ReadOnlyMemory <byte>)>(); for (int i = 0; i < 127; i++) { toProcess.Add((Guid.NewGuid().ToString().AsMemory(), bytaData.AsMemory())); } toProcess.Add((Guid.NewGuid().ToString().AsMemory(), failingByteData.AsMemory())); HttpClientHandler handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate }; // end - setup some sample data Console.WriteLine("Ready!!"); Console.ReadKey(); var client = new HttpClient(handler); using (var request = new BulkRequest()) { request.AttachContentStream(toProcess); var response = await client.SendAsync(request.GetHttpRequestMessage(), HttpCompletionOption.ResponseHeadersRead); if (response.IsSuccessStatusCode) { using (var contentStream = await response.Content.ReadAsStreamAsync()) { var(success, errors) = await BulkResponseParser.FromStreamAsync(contentStream); } } } Console.WriteLine("Done!!"); Console.ReadKey(); }