code: public static Map<String, String[]> getParameterMap(final Request request)
  	{
  		final Map<String, String[]> map = new HashMap<>();
  		addParameters(request.getRequestParameters(), map);
  		addParameters(request.getQueryParameters(), map);
  		addParameters(request.getPostParameters(), map);
  		return map;
  	}
docs: Gets a map with all parameters. Looks in the query, request and post parameters. Migration
  method from 1.4.* to 1.5.*.
  
  @param request
  the request
  @return a map with all parameters.