### Cluster-writeable probe

The reply is '200 OK' if cluster has write quorum if not it returns '503 Service Unavailable'.

```
curl http://minio1:9001/minio/health/cluster
HTTP/1.1 503 Service Unavailable
Accept-Ranges: bytes
Content-Length: 0
Server: MinIO
Vary: Origin
X-Amz-Bucket-Region: us-east-1
X-Minio-Write-Quorum: 3
X-Amz-Request-Id: 16239D6AB80EBECF
X-Xss-Protection: 1; mode=block
Date: Tue, 21 Jul 2020 00:36:14 GMT
```

    public void initResults() throws IOException {
        final BytesStreamOutput tmp = new BytesStreamOutput();
        final long bytes = new ByteSizeValue(dataMb, ByteSizeUnit.MB).getBytes();
        for (int i = 0; i < bytes / 8; i++) {
            tmp.writeLong(i);
        }
        pagedBytes = tmp.bytes();
        if (pagedBytes instanceof PagedBytesReference == false) {

 * <tr>
 * <th>{@link InputStream}</th>
 * <td>bytes</td>
 * <td>characters</td>
 * <td>bytes, characters</td>
 * <td>characters</td>
 * </tr>
 * <tr>
 * <th>{@link Reader}</th>
 * <td>characters</td>
 * <td>characters</td>
 * <td>characters</td>
 * <td>characters</td>
 * </tr>
 * <tr>
 * <th>{@link File}</th>
 * <td>bytes</td>
 * <td>characters</td>
 * <td>bytes, characters</td>
 * <td>characters</td>
 * </tr>

  private val readCompleteLatch = CountDownLatch(1)

  // The lists are held as a large array of UTF-8 bytes. This is to avoid allocating lots of strings
  // that will likely never be used. Each rule is separated by '\n'. Please see the
  // PublicSuffixListGenerator class for how these lists are generated.
  // Guarded by this.
  override lateinit var bytes: ByteString
  override lateinit var exceptionBytes: ByteString

		"Average dial time of internode TCP calls in nanoseconds")
	internodeSentBytesTotalMD = NewCounterMD(internodeSentBytesTotal,
		"Total number of bytes sent to other peer nodes")
	internodeRecvBytesTotalMD = NewCounterMD(internodeRecvBytesTotal,
		"Total number of bytes received from other peer nodes")
)

// loadNetworkInternodeMetrics - reads internode network metrics.
//
// This is a `MetricsLoaderFn`.

      listeners.put(state, listener);
    }

    return slackApi.authorizeUrl(scopes, redirectUrl(), state, team);
  }

  private ByteString randomToken() {
    byte[] bytes = new byte[16];
    secureRandom.nextBytes(bytes);
    return ByteString.of(bytes);
  }

  private HttpUrl redirectUrl() {
    return mockWebServer.url("/oauth/");
  }

        // Encode input parameters for WitnessUnregister

        // Context handle (20 bytes) - this is both input and output (modified)
        if (contextHandle != null) {
            buf.writeOctetArray(contextHandle, 0, Math.min(contextHandle.length, 20));
            // Pad with zeros if context handle is shorter than 20 bytes
            for (int i = contextHandle.length; i < 20; i++) {
                buf.enc_ndr_small(0);

        // When
        byte[] bytes;
        try (ByteArrayOutputStream bout = new ByteArrayOutputStream(); ObjectOutputStream oout = new ObjectOutputStream(bout)) {
            oout.writeObject(original);
            oout.flush();
            bytes = bout.toByteArray();
        }

        SpnegoException restored;

        byte[] buffer = new byte[24];

        // Mock allocation size (8 bytes)
        for (int i = 0; i < 8; i++) {
            buffer[i] = (byte) i;
        }

        // Mock end of file (8 bytes)
        for (int i = 8; i < 16; i++) {
            buffer[i] = (byte) (i * 2);
        }

        // Mock number of links (4 bytes)
        buffer[16] = 0x01;
        buffer[17] = 0x00;

    public Smb2WriteResponse(final Configuration config) {
        super(config);
    }

    /**
     * Returns the number of bytes written.
     *
     * @return the count
     */
    public final int getCount() {
        return this.count;
    }

    /**
     * Returns the number of bytes remaining to be written.
     *
     * @return the remaining
     */
    public final int getRemaining() {