synchronized (PROTOCOL_HANDLERS) {
            URLStreamHandler handler = PROTOCOL_HANDLERS.get(protocol);
            if (handler != null) {
                return handler;
            }
            if (factory != null) {
                handler = factory.createURLStreamHandler(protocol);
            }
            if (handler == null) {

     *
     * @param protocol
     *            The URL protocol. Must not be {@literal null} or empty.
     * @param factory
     *            The {@link Traverser} factory for the protocol. Must not be {@literal null}.
     */
    public static void addTraverserFactory(final String protocol, final TraverserFactory factory) {
        assertArgumentNotEmpty("protocol", protocol);

    // Getters and setters

    /**
     * Get the minimum SMB Direct protocol version
     *
     * @return minimum protocol version
     */
    public int getMinVersion() {
        return minVersion;
    }

    /**
     * Set the minimum SMB Direct protocol version
     *
     * @param minVersion minimum protocol version
     */
    public void setMinVersion(int minVersion) {

        final Smb2TransformHeader header = new Smb2TransformHeader();

        // Check protocol ID
        final int protocolId = SMBUtil.readInt4(buffer, bufferIndex);
        if (protocolId != TRANSFORM_PROTOCOL_ID) {
            throw new IllegalArgumentException("Invalid transform header protocol ID: 0x" + Integer.toHexString(protocolId));
        }
        bufferIndex += 4;

        // Read signature

      when (val protocol = sslSocket.applicationProtocol) {
        null, "" -> null
        else -> protocol
      }
    } catch (e: UnsupportedOperationException) {
      // https://docs.oracle.com/javase/9/docs/api/javax/net/ssl/SSLSocket.html#getApplicationProtocol--
      null
    }

  override fun trustManager(sslSocketFactory: SSLSocketFactory): X509TrustManager? {

    delegate.protocolNegotiationEnabled = protocolNegotiationEnabled
  }

  @JvmName("-deprecated_protocols")
  fun setProtocols(protocols: List<Protocol>) {
    delegate.protocols = protocols
  }

  @JvmName("-deprecated_protocols")
  fun protocols(): List<Protocol> = delegate.protocols

  fun useHttps(
    sslSocketFactory: SSLSocketFactory,
    tunnelProxy: Boolean,
  ) {

        String protocol = "perlookup";

        Wagon one = wagonManager.getWagon(protocol);
        Wagon two = wagonManager.getWagon(protocol);

        assertNotSame(one, two);
    }

    private void assertWagon(String protocol) throws Exception {
        Wagon wagon = wagonManager.getWagon(protocol);

        assertNotNull(wagon, "Check wagon, protocol=" + protocol);
    }

   * HTTPS.
   */
  fun handshake(): Handshake?

  /**
   * Returns the protocol negotiated by this connection, or [Protocol.HTTP_1_1] if no protocol
   * has been negotiated. This method returns [Protocol.HTTP_1_1] even if the remote peer is using
   * [Protocol.HTTP_1_0].
   */
  fun protocol(): Protocol

/**
 * Enumeration of supported SMB Witness Protocol versions as defined in MS-SWN specification.
 * Each version corresponds to different Windows Server releases and capabilities.
 */
public enum WitnessVersion {
    /**
     * Witness Protocol Version 1 - Windows Server 2012
     */
    VERSION_1(0x00010001),

    /**
     * Witness Protocol Version 2 - Windows Server 2012 R2 and later
     */

   - Identify beta testers for early access

## References

- [MS-SMB2]: Server Message Block (SMB) Protocol Version 2 and 3
- [MS-SWN]: Service Witness Protocol
- [MS-SMBD]: SMB2 Remote Direct Memory Access (RDMA) Transport Protocol
- Windows Protocol Test Suites