@Autowired HttpServletRequest vs passing as parameter - best practice

Question

Assume we have defined a controller class which has @Controller annotation only.

Inside the class, we have defined private @Autowired HttpServletR

Answer 1

Both are ok.
@Autowired HttpServletRequest and passing as a parameter are the same things.

Before passing HttpServletRequest to invocation method responding to @RequestMapping function, Spring stores the HttpServletRequest into a ThreadLocal type variable.

That ThreadLocal variable is a thread-safe map that keeps HttpServletRequest in the current thread context. The @Autowired HttpServletRequest proxy bean gets the correct request from that ThreadLocal variable.