open fun afterHandshake(sslSocket: SSLSocket) {
  }

  /** Returns the negotiated protocol, or null if no protocol was negotiated. */
  open fun getSelectedProtocol(sslSocket: SSLSocket): String? = null

  /** For MockWebServer. This returns the inbound SNI names. */
  @SuppressLint("NewApi")
  @IgnoreJRERequirement // This function is overridden to require API >= 24.

      }

      // Success! Save the handshake and the ALPN protocol.
      val maybeProtocol =
        if (connectionSpec.supportsTlsExtensions) {
          Platform.get().getSelectedProtocol(sslSocket)
        } else {
          null
        }
      socket = sslSocket
      source = sslSocket.source().buffer()
      sink = sslSocket.sink().buffer()

          }

          sslSocket.startHandshake()

          if (protocolNegotiationEnabled) {
            val protocolString = Platform.get().getSelectedProtocol(sslSocket)
            protocol =
              when {
                protocolString != null -> Protocol.get(protocolString)
                else -> Protocol.HTTP_1_1
              }