Spring MVC – How to get all request params in a map in Spring controller?

Sample URL:

../search/?attr1=value1&attr2=value2&attr4=value4

I do not know the names of attr1, att2, and attr4.

I would like to be able to do something like that (or similar, don’t care, just as long as I have access to the Map of request param name -> value:

@RequestMapping(value = "/search/{parameters}", method = RequestMethod.GET)
public void search(HttpServletRequest request, 
@PathVariable Map<String,String> allRequestParams, ModelMap model)
throws Exception {//TODO: implement}

How can I achieve this with Spring MVC?