protected SslContext getClientSslContext(Registry spectatorRegistry) {
        return new ClientSslContextFactory(spectatorRegistry).getClientSslContext();
    }
This method can be overridden to create your own custom SSL context

@param spectatorRegistry metrics registry
@return Netty SslContext
zuul-core/src/main/java/com/netflix/zuul/netty/connectionpool/DefaultOriginChannelInitializer.java