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copied!<p>As no-one answering seems to have done it, I spent the time working it out based on guidance from Steve's answer:</p> <p>In answer to this question "is there any good examples of doing the authentication into S3 request using HTTPWebRequest, so I can duplicate what I do with Cloud Files?", here is how to generate the auth header manually:</p> <pre><code>string today = String.Format("{0:ddd,' 'dd' 'MMM' 'yyyy' 'HH':'mm':'ss' 'zz00}", DateTime.Now); string stringToSign = "PUT\n" + "\n" + file.SelectSingleNode("content_type").InnerText + "\n" + "\n" + "x-amz-date:" + today + "\n" + "/" + strBucketName + "/" + strKey; Encoding ae = new UTF8Encoding(); HMACSHA1 signature = new HMACSHA1(ae.GetBytes(AWSSecret)); string encodedCanonical = Convert.ToBase64String(signature.ComputeHash(ae.GetBytes(stringToSign))); string authHeader = "AWS " + AWSKey + ":" + encodedCanonical; string uriS3 = "https://" + strBucketName + ".s3.amazonaws.com/" + strKey; var reqS3 = (HttpWebRequest)WebRequest.Create(uriS3); reqS3.Headers.Add("Authorization", authHeader); reqS3.Headers.Add("x-amz-date", today); reqS3.ContentType = file.SelectSingleNode("content_type").InnerText; reqS3.ContentLength = Convert.ToInt32(file.SelectSingleNode("bytes").InnerText); reqS3.Method = "PUT"; </code></pre> <p>Note the added <code>x-amz-date</code> header as HTTPWebRequest sends the date in a different format to what AWS is expecting.</p> <p>From there it was just a case of repeating what I was already doing.</p>

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