springMvc 處理HttpRepsonse時 同時設置response.setStatus(301)和response.sendRedirect("/hello");時，HTTP response Headers status is 302調換兩個的位置也是如此，所以想理解下具體的原理相關代碼  //input   response.sendRedirect("/hello");  response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);// outputRequest URL: http://localhost:9999/account/listRequest Method: GET Status Code: 302 Remote Address: [::1]:9999Referrer Policy: no-referrer-when-downgrade HTTP/1.1 302Location: http://localhost:9999/helloContent-Length: 0Date: Sun, 29 Jul 2018 17:38:31 GMT