public Optional<ProxyConfiguration> getProxyConfiguration() {
        return Optional.ofNullable(proxyConfiguration);
    }
Returns an {@link Optional} object of type {@link ProxyConfiguration} that has the
proxy options for the client. The returned {@link Optional} can contain null value.

@return An {@link Optional} object of type {@link ProxyConfiguration}.
aws-java-sdk-opensdk/src/main/java/com/amazonaws/opensdk/internal/config/ApiGatewayClientConfiguration.java