@Override
    public HttpHost getProxyHost() {
        return this.proxyChain == null ? null : this.proxyChain[0];
    }
Tracks layering a protocol.

@param secure    {@code true} if the route is secure,
                 {@code false} otherwise
httpclient5/src/main/java/org/apache/hc/client5/http/RouteTracker.java