By default, OkHttp will attempt a `MODERN_TLS` connection.  However by configuring the client connectionSpecs you can allow a fall back to `COMPATIBLE_TLS` connection if the modern configuration fails.

```java
OkHttpClient client = new OkHttpClient.Builder()
    .connectionSpecs(Arrays.asList(ConnectionSpec.MODERN_TLS, ConnectionSpec.COMPATIBLE_TLS))
    .build();
```

      certificatePinner = useCertificatePinner,
      proxyAuthenticator = proxyAuthenticator,
      proxy = proxy,
      protocols = call.client.protocols,
      connectionSpecs = call.client.connectionSpecs,
      proxySelector = proxySelector,
    )
  }

  }

  @Test
  fun connectionSpec() {
    var connectionSpec: ConnectionSpec = ConnectionSpec.RESTRICTED_TLS
    connectionSpec = ConnectionSpec.MODERN_TLS
    connectionSpec = ConnectionSpec.COMPATIBLE_TLS
    connectionSpec = ConnectionSpec.CLEARTEXT
    val tlsVersions: List<TlsVersion>? = connectionSpec.tlsVersions
    val cipherSuites: List<CipherSuite>? = connectionSpec.cipherSuites

}

public final class okhttp3/ConnectionSpec {
	public static final field CLEARTEXT Lokhttp3/ConnectionSpec;
	public static final field COMPATIBLE_TLS Lokhttp3/ConnectionSpec;
	public static final field Companion Lokhttp3/ConnectionSpec$Companion;
	public static final field MODERN_TLS Lokhttp3/ConnectionSpec;
	public static final field RESTRICTED_TLS Lokhttp3/ConnectionSpec;

    client =
      client
        .newBuilder()
        .hostnameVerifier(RecordingHostnameVerifier())
        .connectionSpecs(
          // Attempt RESTRICTED_TLS then fall back to MODERN_TLS.
          listOf(
            ConnectionSpec.RESTRICTED_TLS,
            ConnectionSpec.MODERN_TLS,
          ),
        ).sslSocketFactory(
          suppressTlsFallbackClientSocketFactory(),

      OverrideParam.RetryOnConnectionFailure -> {
        enableTls()
        var first = true
        client =
          client
            .newBuilder()
            .connectionSpecs(listOf(ConnectionSpec.RESTRICTED_TLS, ConnectionSpec.MODERN_TLS))
            .eventListener(
              object : EventListener() {
                override fun secureConnectEnd(
                  call: Call,

}

public final class okhttp3/ConnectionSpec {
	public static final field CLEARTEXT Lokhttp3/ConnectionSpec;
	public static final field COMPATIBLE_TLS Lokhttp3/ConnectionSpec;
	public static final field Companion Lokhttp3/ConnectionSpec$Companion;
	public static final field MODERN_TLS Lokhttp3/ConnectionSpec;
	public static final field RESTRICTED_TLS Lokhttp3/ConnectionSpec;