@Override
    public final HttpRoute determineRoute(final HttpHost host, final HttpContext context) throws HttpException {
        return determineRoute(host, null, context);
    }
Default implementation of an {@link HttpRoutePlanner}. It will not make use of
any Java system properties, nor of system or browser proxy settings.

@since 4.3
httpclient5/src/main/java/org/apache/hc/client5/http/impl/routing/DefaultRoutePlanner.java