@Override
        public PoolingHttpClientConnectionManager create(Registry<ConnectionSocketFactory> socketFactories) {
            PoolingHttpClientConnectionManager manager = connectionManagerFactory.create(socketFactories);
            manager.setDefaultConnectionConfig(connectionConfigBuilder.build());
            return manager;
        }
Sync HTTP client builder <em>for internal Vespa communications over http/https.</em>
Configures Vespa mTLS and handles TLS mixed mode automatically.
Custom connection managers must be configured through {@link #connectionManagerFactory(HttpClientConnectionManagerFactory)}.

@author jonmv
http-utils/src/main/java/ai/vespa/util/http/hc5/VespaHttpClientBuilder.java