clientETag, err := etag.FromContentMD5(r.Header)
	if err != nil {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidDigest), r.URL)
		return
	}

	// if Content-Length is unknown/missing, deny the request
	size := r.ContentLength
	rAuthType := getRequestAuthType(r)
	switch rAuthType {
	// Check signature types that must have content length

     "s3:GetObjectVersion",
     "s3:ListMultipartUploadParts"
    ],
    "Resource": [
     "arn:aws:s3:::%s/*"
    ]
   },
   {
    "Sid": "DenyDeleteVersionAction",
    "Effect": "Deny",
    "Action": [
     "s3:DeleteObjectVersion"
    ],
    "Resource": [
     "arn:aws:s3:::%s/*"
    ]
   }
  ]
 }
`, bucket, bucket)

  `I didn't!' the March Hare interrupted in a great hurry.

  `You did!' said the Hatter.

  `I deny it!' said the March Hare.

  `He denies it,' said the King:  `leave out that part.'

  `Well, at any rate, the Dormouse said--' the Hatter went on,
looking anxiously round to see if he would deny it too:  but the
Dormouse denied nothing, being fast asleep.