@Deprecated
    @Override
    protected void doApply(ApiResponse response, IPolicyContext context, CachingConfig config,
            IPolicyChain<ApiResponse> chain) {
        chain.doApply(response);
    }
@see AbstractMappedPolicy#doApply(ApiResponse, IPolicyContext, Object, IPolicyChain)
gateway/engine/policies/src/main/java/io/apiman/gateway/engine/policies/CachingPolicy.java