https://www.baeldung.com/spring-request-param
/**
* benjamin
* 25
* name=benjamin
* {"name":"benjamin","age":25}
*/
@PostMapping("/mvc")
public String mvc(@RequestParam(required = true) String name, HttpServletRequest request, @RequestBody String body) {
System.out.println(name);
String age = request.getHeader("age");
System.out.println(age);
System.out.println(request.getQueryString());
System.out.println(body);
return "";
}
