:redirect_status — swaps the explicit atom :status option of
Phoenix.Controller.redirect/2 for a plausible redirect-status sibling.
redirect(conn, to: "/login", status: :found) # → :moved_permanently / :see_other
redirect(conn, to: "/old", status: :moved_permanently) # → :found / :permanent_redirectInteger statuses (status: 302), variables (status: status), and redirects that rely on
Phoenix's implicit default are left alone. Matches redirect written directly
(Phoenix.Controller.redirect(conn, ...)), aliased, or bare-imported (redirect(conn, ...),
the form use MyAppWeb, :controller produces).