valueHolder.name = checkNotNull(name);
      return this;
    }

    // Holder object for values that might be null and/or empty.
    static class ValueHolder {
      @Nullable String name;
      @Nullable Object value;
      @Nullable ValueHolder next;
    }

    /**
     * Holder object for values that cannot be null or empty (will be printed unconditionally). This

// HEAD requests on an object validates the existence of the object.
// The responses for fetching the object when If-Modified-Since
// and If-Unmodified-Since headers set are validated.
// If-Modified-Since - Return the object only if it has been modified since the specified time, else return a 304 (not modified).

		t.Fatal(err)
	}

	bucket := "bucket"
	object := "object"
	opts := ObjectOptions{}
	// Create object "obj" under bucket "bucket".
	_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader([]byte("abcd")), int64(len("abcd")), "", ""), opts)
	if err != nil {
		t.Fatal(err)
	}
	// Upload a good object
	_, err = obj.DeleteObject(ctx, bucket, object, ObjectOptions{})
	if err != nil {
		t.Fatal(err)

		// do an additional verification whether object exists when object is deletemarker and request
		// is from replication
		if opts.CheckDMReplicationReady {
			topts := opts
			topts.VersionID = ""
			goi, gerr := getObjectInfo(ctx, bucket, object, topts)
			if gerr == nil || goi.VersionID != "" { // object layer returned more info because object is deleted
				w.Header().Set(xhttp.MinIOTargetReplicationReady, "true")

				// Read last byte of object
				fmt.Sprintf("bytes=-%d", 1),
				// Read all but first byte of object
				"bytes=1-",
				// Read first half of object
				fmt.Sprintf("bytes=%d-%d", 0, objLen/2),
				// Read last half of object
				fmt.Sprintf("bytes=-%d", objLen/2),
				// Read middle half of object
				fmt.Sprintf("bytes=%d-%d", objLen/4, objLen*3/4),
				// Read 100MiB of the object from the beginning

		26: {bucketName: bucket, objName: object, inputData: data, inputDataSize: int64(len(data) - 1), expectedMd5: getMD5Hash(data[:len(data)-1]), expectedError: ioutil.ErrOverread},
		27: {bucketName: bucket, objName: object, inputData: nilBytes, inputDataSize: int64(len(nilBytes) + 1), expectedMd5: getMD5Hash(nilBytes), expectedError: IncompleteBody{Bucket: bucket, Object: object}},

		if err != nil {
			t.Fatalf("%s : %s", instanceType, err.Error())
		}

		for _, object := range testCase.objectToUploads {
			md5Bytes := md5.Sum([]byte(object.content))
			oi, err := obj.PutObject(context.Background(), testCase.bucketName, object.name, mustGetPutObjReader(t, strings.NewReader(object.content),
				int64(len(object.content)), hex.EncodeToString(md5Bytes[:]), ""), ObjectOptions{})
			if err != nil {
				t.Log(oi)

}

func putOpts(ctx context.Context, bucket, object, vid string, hdrs http.Header, metadata map[string]string) (opts ObjectOptions, err error) {
	versioned := globalBucketVersioningSys.PrefixEnabled(bucket, object)
	versionSuspended := globalBucketVersioningSys.PrefixSuspended(bucket, object)

	vid = strings.TrimSpace(vid)
	if vid != "" && vid != nullVersionID {

		},
		{
			object: "object.json",
			header: http.Header{
				"Content-Type": []string{"application/json"},
			},
			result: false,
		},
		{
			object: "object.txt",
			header: http.Header{
				"Content-Type": []string{"text/plain"},
			},
			result: false,
		},
		{
			object: "object",
			header: http.Header{
				"Content-Type": []string{"text/something"},
			},
			result: false,

func checkObjectNameForLengthAndSlash(bucket, object string) error {
	// Check for the length of object name
	if len(object) > 1024 {
		return ObjectNameTooLong{
			Bucket: bucket,
			Object: object,
		}
	}
	// Check for slash as prefix in object name
	if HasPrefix(object, SlashSeparator) {
		return ObjectNamePrefixAsSlash{