t.Fatalf("%s : %s", instanceType, err)
	}
	// Initiate Multipart Upload on the above created bucket.
	res, err := obj.NewMultipartUpload(context.Background(), bucketNames[0], objectNames[0], ObjectOptions{UserDefined: map[string]string{"X-Amz-Meta-Id": "id"}})
	if err != nil {
		// Failed to create NewMultipartUpload, abort.
		t.Fatalf("%s : %s", instanceType, err)
	}

	uploadIDs = append(uploadIDs, res.UploadID)

			if err != nil {
				t.Error("Unexpected error: ", err)
			}
			for k, v := range testCase.expectedHeaders {
				if objInfo.UserDefined[k] != v {
					t.Errorf("Expected to have header %s with value %s, but found value `%s` instead", k, v, objInfo.UserDefined[k])
				}
			}
		}
	}

	region := "us-east-1"
	// Test cases for signature-V4.
	testCasesV4BadData := []struct {

":"1.0","configurationId":"Config","bucket":{"name":"images","ownerIdentity":{"principalId":"minio"},"arn":"arn:aws:s3:::images"},"object":{"key":"myphoto.jpg","size":248682,"eTag":"f1671feacb8bbf7b0397c6e9364e8c92","contentType":"image/jpeg","userDefined":{"content-type":"image/jpeg"},"versionId":"1","sequencer":"14CF20BD1EFD5B93"}},"source":{"host":"192.168.1.80","port":"55328","userAgent":"MinIO (linux; amd64) minio-go/2.0.4 mc/DEVELOPMENT.GOGET"}}],"level":"info","msg":"","time":"2017-07-07T11:46:37-07:00"}...

		for _, kv := range ef.Metadata {
			// Object (version) must match all x-amz-meta and
			// standard metadata headers
			// specified in the filter
			var match bool
			for k, v := range obj.UserDefined {
				if !stringsHasPrefixFold(k, "x-amz-meta-") && !isStandardHeader(k) {
					continue
				}
				// We only need to match x-amz-meta or standardHeaders
				if kv.Match(BatchJobKV{Key: k, Value: v}) {

	// etag/md5Sum has already been extracted. We need to
	// remove to avoid it from appearing as part of
	// response headers. e.g, X-Minio-* or X-Amz-*.
	// Tags have also been extracted, we remove that as well.
	objInfo.UserDefined = cleanMetadata(fi.Metadata)

	// All the parts per object.
	objInfo.Parts = fi.Parts

	// Update storage class
	if fi.TransitionTier != "" {
		objInfo.StorageClass = fi.TransitionTier

			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMalformedPOSTRequest), r.URL)
			return
		}
		tagsStr := tags.String()
		opts.UserDefined[xhttp.AmzObjectTagging] = tagsStr
	} else {
		// avoid user set an invalid tag using `X-Amz-Tagging`
		delete(opts.UserDefined, xhttp.AmzObjectTagging)
	}

	objInfo, err := objectAPI.PutObject(ctx, bucket, object, pReader, opts)
	if err != nil {