private String getJsonpParameterValue(HttpServletRequest request) {
        if (this.jsonpParameterNames != null) {
            for (String name : this.jsonpParameterNames) {
                String value = request.getParameter(name);

                if (IOUtils.isValidJsonpQueryParam(value)) {
                    return value;
                }

                if (logger.isDebugEnabled()) {
                    logger.debug("Ignoring invalid jsonp parameter value: " + value);
                }
            }
        }
        return null;
    }
Set JSONP request parameter names. Each time a request has one of those
parameters, the resulting JSON will be wrapped into a function named as
specified by the JSONP request parameter value.
<p>The parameter names configured by default are "jsonp" and "callback".

@see <a href="http://en.wikipedia.org/wiki/JSONP">JSONP Wikipedia article</a>
@since 4.1
fastjson1-compatible/src/main/java/com/alibaba/fastjson/support/spring/FastJsonJsonView.java