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    <p>This is a true hack (which would probably break with a new implementation of the AWSSDK), and it requires knowledge of the length of the file being requested, but if you wrap the response stream as shown with <a href="https://gist.github.com/joeenzminger/7460006" rel="nofollow">this class (a gist)</a> as shown below:</p> <pre><code>long length = fileLength; </code></pre> <p>you can get file length in several ways. I am uploading from a dropbox link, so they give me the length along with the url. Alternatively, you can perform a HEAD request and get the Content-Length. </p> <pre><code>string uri = RSConnection.StorageUrl + "/" + container + "/" + file.SelectSingleNode("name").InnerText; var req = (HttpWebRequest)WebRequest.Create(uri); req.Headers.Add("X-Auth-Token", RSConnection.AuthToken); req.Method = "GET"; using (var resp = req.GetResponse() as HttpWebResponse) { using (Stream stream = resp.GetResponseStream()) { //I haven't tested this path Amazon.S3.Transfer.TransferUtility trans = new Amazon.S3.Transfer.TransferUtility(S3Client); trans.Upload(new HttpResponseStream(stream, length), config.Element("root").Element("S3BackupBucket").Value, container + file.SelectSingleNode("name").InnerText); //Use EITHER the above OR the below //I have tested this with dropbox data PutObjectRequest putReq = new PutObjectRequest(); putReq.WithBucketName(config.Element("root").Element("S3BackupBucket").Value); putReq.WithKey(container + file.SelectSingleNode("name").InnerText); putReq.WithInputStream(new HttpResponseStream(stream, length))); //These are necessary for really large files to work putReq.WithTimeout(System.Threading.Timeout.Infinite); putReq.WithReadWriteTimeout(System.Thread.Timeout.Infinite); using (S3Response putResp = S3Client.PutObject(putReq)) { } } } </code></pre> <p>The hack is overriding the Position and Length properties, and returning 0 for Position{get}, noop'ing Position{set}, and returning the known length for Length. </p> <p>I recognize that this might not work if you don't have the length or if the server providing the source does not support HEAD requests and Content-Length headers. I also realize it might not work if the reported Content-Length or the supplied length doesn't match the actual length of the file.</p> <p>In my test, I also supply the Content-Type to the PutObjectRequest, but I don't that that is necessary.</p>
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    1. POUpload to S3 from HTTPWebResponse.GetResponseStream() in c#
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    1. USJoe Enzminger
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