if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	aclHeader := r.Header.Get(xhttp.AmzACL)
	if aclHeader == "" {
		acl := &accessControlPolicy{}
		if err = xmlDecoder(r.Body, acl, r.ContentLength); err != nil {
			if terr, ok := err.(*xml.SyntaxError); ok && terr.Msg == io.EOF.Error() {
				writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMalformedXML),
					r.URL)
				return
			}

// it is used to ignore custom encoding charset in S3 XML body.
func nopCharsetConverter(label string, input io.Reader) (io.Reader, error) {
	return input, nil
}

// xmlDecoder provide decoded value in xml.
func xmlDecoder(body io.Reader, v interface{}, size int64) error {
	var lbody io.Reader
	if size > 0 {
		lbody = io.LimitReader(body, size)
	} else {
		lbody = body
	}
	d := xml.NewDecoder(lbody)

	// If the request has no body with content-length set to 0,
	// we do not have to validate location constraint. Bucket will
	// be created at default region.
	locationConstraint := createBucketLocationConfiguration{}
	err := xmlDecoder(r.Body, &locationConstraint, r.ContentLength)
	if err != nil && r.ContentLength != 0 {
		internalLogOnceIf(GlobalContext, err, "location-constraint-xml-parsing")
		// Treat all other failures as XML parsing errors.

	if r.ContentLength <= 0 {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMissingPart), r.URL)
		return
	}

	complMultipartUpload := &CompleteMultipartUpload{}
	if err = xmlDecoder(r.Body, complMultipartUpload, r.ContentLength); err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}
	if len(complMultipartUpload.Parts) == 0 {

		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrEntityTooLarge), r.URL)
		return
	}

	// Unmarshal list of keys to be deleted.
	deleteObjectsReq := &DeleteObjectsRequest{}
	if err := xmlDecoder(r.Body, deleteObjectsReq, maxBodySize); err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	objects := make([]ObjectV, len(deleteObjectsReq.Objects))

		apiRouter.ServeHTTP(rec, req)
		if rec.Code != http.StatusOK {
			t.Fatalf("Test failed to create HTTP request for copy %d", rec.Code)
		}

		resp := &CopyObjectPartResponse{}
		if err = xmlDecoder(rec.Body, resp, rec.Result().ContentLength); err != nil {
			t.Fatalf("Test failed to decode XML response: <ERROR> %v", err)
		}

		parts = append(parts, CompletePart{
			PartNumber: partNumber,