@UnstableApi
    public ClientFactoryBuilder tlsProvider(TlsProvider tlsProvider, ClientTlsConfig tlsConfig) {
        tlsProvider(tlsProvider);
        this.tlsConfig = requireNonNull(tlsConfig, "tlsConfig");
        return this;
    }
Sets the {@link TlsProvider} that provides {@link TlsKeyPair}s for client certificate authentication.
core/src/main/java/com/linecorp/armeria/client/ClientFactoryBuilder.java