Amazon.S3.Util.AmazonS3Util.PostUpload C# (CSharp) Method

        public static S3PostUploadResponse PostUpload(S3PostUploadRequest request)
        {
            string url;
            string subdomain = request.Region.Equals(RegionEndpoint.USEast1) ? "s3" : "s3-" + request.Region.SystemName;

            if (request.Bucket.IndexOf('.') > -1)
                url = string.Format(CultureInfo.InvariantCulture, "https://{0}.amazonaws.com/{1}/", subdomain, request.Bucket);
            else
                url = string.Format(CultureInfo.InvariantCulture, "https://{0}.{1}.amazonaws.com", request.Bucket, subdomain);
            Uri uri = new Uri(url);

            HttpWebRequest webRequest = WebRequest.Create(uri) as HttpWebRequest;

            var boundary = Convert.ToBase64String(Guid.NewGuid().ToByteArray()).Replace('=', 'z');

            webRequest.ContentType = string.Format(CultureInfo.InvariantCulture, "multipart/form-data; boundary={0}", boundary);
            webRequest.Method = "POST";

            using (var reqStream = webRequest.GetRequestStream())
            {
                request.WriteFormData(boundary, reqStream);

                byte[] boundaryBytes = Encoding.UTF8.GetBytes(string.Format(CultureInfo.InvariantCulture, "--{0}\r\nContent-Disposition: form-data; name=\"file\"\r\n\r\n", boundary));

                reqStream.Write(boundaryBytes, 0, boundaryBytes.Length);

                using (var inputStream = null == request.Path ? request.InputStream : File.OpenRead(request.Path))
                {
                    byte[] buf = new byte[1024];
                    int bytesRead;
                    while ((bytesRead = inputStream.Read(buf, 0, 1024)) > 0)
                    {
                        reqStream.Write(buf, 0, bytesRead);
                    }
                }

                byte[] endBoundaryBytes = Encoding.UTF8.GetBytes(string.Format(CultureInfo.InvariantCulture, "\r\n--{0}--", boundary));

                reqStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
            }

            HttpWebResponse response = null;
            try
            {
                response = webRequest.GetResponse() as HttpWebResponse;
            }
            catch (WebException ex)
            {
                throw S3PostUploadException.FromResponse((HttpWebResponse)ex.Response);
            }

            return S3PostUploadResponse.FromWebResponse(response);
        }
    }