To ensure that data is not corrupted traversing the network, use the Content-MD5 form field. Whenyou use this form field, Amazon S3 checks the object against the provided MD5 value. If they do notmatch, Amazon S3 returns an error. The status code returned to the client upon successful upload ifsuccess_action_redirect is not specified. Accepts the values 200, 201, or 204 (default). http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPOST.html