@UnstableApi
    public VirtualHostBuilder tlsEngineType(TlsEngineType tlsEngineType) {
        requireNonNull(tlsEngineType, "tlsEngineType");
        this.tlsEngineType = tlsEngineType;
        return this;
    }
The {@link TlsEngineType} that will be used for processing TLS connections.
core/src/main/java/com/linecorp/armeria/server/VirtualHostBuilder.java