Spring RedirectAttributes: addAttribute() vs addFlashAttribute()

Question

My understanding so far is on our controller request mapping method we can specify RedirectAttributes parameter and populate it with attributes for when the request

Answer 1

Javadoc description: "A FlashMap provides a way for one request to store attributes intended for use in another. This is most commonly needed when redirecting from one URL to another -- e.g. the Post/Redirect/Get pattern. A FlashMap is saved before the redirect (typically in the session) and is made available after the redirect and removed immediately."