socket.enabledCipherSuites = arrayOf("TLS_A")
    val connectionSpec =
      ConnectionSpec
        .Builder(true)
        .tlsVersions(TlsVersion.TLS_1_0)
        .cipherSuites("TLS_A")
        .build()
    applyConnectionSpec(connectionSpec, socket, true)
    assertArrayEquals(
      arrayOf("TLS_A", "TLS_FALLBACK_SCSV"),
      socket.enabledCipherSuites,

    // cipher is added to signal that a protocol fallback has taken place.
    val supportedCipherSuites = sslSocket.supportedCipherSuites
    val indexOfFallbackScsv =
      supportedCipherSuites.indexOf(
        "TLS_FALLBACK_SCSV",
        CipherSuite.ORDER_BY_NAME,
      )
    if (isFallback && indexOfFallbackScsv != -1) {
      cipherSuitesIntersection =
        cipherSuitesIntersection.concat(

    platform.assumeNotConscrypt()
    val tlsFallbackScsv = "TLS_FALLBACK_SCSV"
    val supportedCiphers = listOf(*handshakeCertificates.sslSocketFactory().supportedCipherSuites)
    if (!supportedCiphers.contains(tlsFallbackScsv)) {
      // This only works if the client socket supports TLS_FALLBACK_SCSV.
      return
    }
    server.useHttps(handshakeCertificates.sslSocketFactory())

	public static final field TLS_ECDH_anon_WITH_RC4_128_SHA Lokhttp3/CipherSuite;
	public static final field TLS_EMPTY_RENEGOTIATION_INFO_SCSV Lokhttp3/CipherSuite;
	public static final field TLS_FALLBACK_SCSV Lokhttp3/CipherSuite;
	public static final field TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5 Lokhttp3/CipherSuite;
	public static final field TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA Lokhttp3/CipherSuite;

    server.protocolNegotiationEnabled = true
    server.protocols = client.protocols
  }

  /**
   * Used during tests that involve TLS connection fallback attempts. OkHttp includes the
   * TLS_FALLBACK_SCSV cipher on fallback connections. See [FallbackTestClientSocketFactory]
   * for details.
   */