@Override
    protected void setResponseContentType(HttpServletRequest request, HttpServletResponse response) {
        super.setResponseContentType(request, response);
    }
Filters out undesired attributes from the given model. The return value
can be either another {@link Map}, or a single value object.
<p>
Default implementation removes {@link BindingResult} instances and
entries not included in the {@link #setRenderedAttributes(Set)
renderedAttributes} property.

@param model the model, as passed on to {@link #renderMergedOutputModel}
@return the object to be rendered
fastjson1-compatible/src/main/java/com/alibaba/fastjson/support/spring/annotation/FastJsonView.java