java - How to set response header in spring mvc

Question

I have a method in which i want to set response header cache-control and pragma :-

public String addUser(@Valid User user, BindingResult bindingResult)
{
    if(bindingResult.hasErrors())
    {
        bindingResult.getFieldError();
        return"edit";
    }
    return "redirect:/welcome/profile/"+user.getName();
}

In this method i want to set cache-control and pragma like we do in simple servlet code using HttpservletResponse calling setHeader method :-

response.setHeader("Cache-Control","no-cache,no-store,must-revalidate");
    response.setHeader("Pragma","no-cache");
    response.setDateHeader("Expires", 0);

I searched spring docs and could not find any direct way to do it, but I found this:-

@RequestMapping("/something")
public ResponseEntity<String> handle(HttpEntity<byte[]> requestEntity) throws UnsupportedEncodingException 
{
    String requestHeader = requestEntity.getHeaders().getFirst("MyRequestHeader"));
    byte[] requestBody = requestEntity.getBody();
    HttpHeaders responseHeaders = new HttpHeaders();
    responseHeaders.set("MyResponseHeader", "MyValue");
    return new ResponseEntity<String>("Hello World", responseHeaders, HttpStatus.CREATED);
}

But I dont know how to use it

Answer 1

If you want to set headers for every response for a controller you can use @ModelAttribute annotation.

@ModelAttribute
public void setVaryResponseHeader(HttpServletResponse response) {
    response.setHeader("Vary", "Accept");
}