public Optional<String> getNonProxyHosts() {
        return Optional.ofNullable(nonProxyHosts);
    }
Returns the optional hosts the client will access without going
through the proxy. Returns either the nonProxyHosts set on this
object, or if not provided, checks the value of the Java system property
for nonProxyHosts according to {@link #getProtocol()}: i.e. if
protocol is https, returns null, otherwise returns value of http.nonProxyHosts.

@return The hosts the client will connect through bypassing the proxy.
aws-java-sdk-opensdk/src/main/java/com/amazonaws/opensdk/config/ProxyConfiguration.java