// to perform all operations defined in the WarmBackend interface.
func checkWarmBackend(ctx context.Context, w WarmBackend) error {
	remoteVersionID, err := w.Put(ctx, probeObject, strings.NewReader("MinIO"), 5)
	if err != nil {
		if _, ok := err.(BackendDown); ok {
			return err
		}
		return tierPermErr{
			Op:  tierPut,
			Err: err,
		}
	}

func (restClient *ReconnectRESTClient) Call(method string, args LockArgs) (status bool, err error) {
	buf, err := args.MarshalMsg(nil)
	if err != nil {
		return false, err
	}
	body := bytes.NewReader(buf)
	respBody, err := restClient.rest.Call(context.Background(), method,
		url.Values{}, body, body.Size())
	defer xhttp.DrainBody(respBody)

	switch toLockError(err) {
	case nil:
		return true, nil

		// Short Content-Md5 header.
		{mustNewSignedShortMD5Request(http.MethodPut, "http://127.0.0.1:9000/", 5, bytes.NewReader([]byte("hello")), t), ErrInvalidDigest},
		// When request is properly signed, but has bad Content-MD5 header.
		{mustNewSignedBadMD5Request(http.MethodPut, "http://127.0.0.1:9000/", 5, bytes.NewReader([]byte("hello")), t), ErrBadDigest},

	b, err := config.Bytes()
	if err != nil {
		return nil, nil, err
	}

	payloadSize := int64(len(b))
	br := bytes.NewReader(b)
	hr, err := hash.NewReader(ctx, br, payloadSize, "", "", payloadSize)
	if err != nil {
		return nil, nil, err
	}
	if GlobalKMS == nil {
		return NewPutObjReader(hr), &ObjectOptions{MaxParity: true}, nil
	}

		t.Fatalf("failed to write to server. %v", err)
	}
	_, err = io.WriteString(c, "message two\n")
	if err != nil {
		t.Fatalf("failed to write to server. %v", err)
	}

	received, err := bufio.NewReader(c).ReadString('\n')
	if err != nil {
		t.Fatalf("failed to read from server. %v", err)
	}
	if received != "messages received\n" {
		t.Fatalf(`client: expected: "messages received\n", got: %v`, received)
	}

			excludeFolders:   true,
		},
	}

	for i, tc := range testcases {
		var v *Versioning
		var err error
		v, err = ParseConfig(strings.NewReader(tc.input))
		if tc.err != err {
			t.Fatalf("Test %d: expected %v but got %v", i+1, tc.err, err)
		}
		if err != nil {
			if tc.err == nil {
				t.Fatalf("Test %d: failed due to %v", i+1, err)
			}

	}
	newReq := req
	newReq.Body = io.NopCloser(
		bytes.NewReader(bytes.Join([][]byte{newChunkHdr, newChunk[:len(newChunk)/2]},
			[]byte(""))),
	)
	return newReq, nil
}

// Malform data given a request signed using streaming signature V4.
func malformDataSigV4(req *http.Request, newByte byte) (*http.Request, error) {
	bufReader := bufio.NewReader(req.Body)
	hexChunkSize, chunkSignature, err := readChunkLine(bufReader)

    File asciiFile = getTestFile("ascii.txt");
    assertThrows(NullPointerException.class, () -> Files.newReader(asciiFile, null));

    assertThrows(NullPointerException.class, () -> Files.newReader(null, UTF_8));

    BufferedReader r = Files.newReader(asciiFile, US_ASCII);
    try {
      assertEquals(ASCII, r.readLine());
    } finally {
      r.close();
    }
  }

	}
	body, err := json.Marshal(payload)
	if err != nil {
		return "", err
	}
	r, err := http.NewRequest(http.MethodPost, reqURL, bytes.NewReader(body))
	if err != nil {
		return "", err
	}

	r.Header.Set("Content-Type", "application/json")

	return c.submitPost(r)

	values.Set("client_id", clientID)
	values.Set("client_secret", clientSecret)
	values.Set("grant_type", "client_credentials")

	req, err := http.NewRequest(http.MethodPost, k.oeConfig.TokenEndpoint, strings.NewReader(values.Encode()))
	if err != nil {
		return err
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	resp, err := k.client.Do(req)
	if err != nil {
		return err
	}