public static HttpClientBuilder createWithBasicConnectionManager() {
        return createBuilder(BasicHttpClientConnectionManager::new);
    }
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