private static SSLConnectionSocketFactory createSslSocketFactory(TlsContext ctx) {
        return SslConnectionSocketFactory.of(ctx, noopVerifier());
    }
Creates a client builder with a {@link BasicHttpClientConnectionManager} configured.
This connection manager uses a single connection for all requests. See Javadoc for details.
http-utils/src/main/java/ai/vespa/util/http/hc4/VespaHttpClientBuilder.java