SpringBoot – add Cache Control Headers in Rest methods

Question

I have a basic SpringBoot 2.0.5.RELEASE app. Using Spring Initializer, JPA, embedded Tomcat, Thymeleaf template engine, and package as an executable JAR

I have created this Rest method:

  @GetMapping(path = "/users/notifications", consumes = "application/json", produces = "application/json")
    public ResponseEntity<List<UserNotification>> userNotifications(
            @RequestHeader(value = "Authorization") String authHeader) {

        User user = authUserOnPath("/users/notifications", authHeader);

        List<UserNotification> menuAlertNotifications = menuService
                .getLast365DaysNotificationsByUser(user);

        return ResponseEntity.ok(menuAlertNotifications)
                .cacheControl(CacheControl.maxAge(60, TimeUnit.SECONDS));;

    }

and I want to add a Cache Control Headers, but I don't know how... I got a compilation error:

Multiple markers at this line
    - The method cacheControl(CacheControl) is undefined for the type 
     ResponseEntity<List<UserNotification>>
    - CacheControl
    - cacheControl

I also add this property in application.properties

security.headers.cache=false

are you using spring security ?

benjamin c
– benjamin c

2018-10-15 06:53:06 +00:00
Commented Oct 15, 2018 at 6:53 — benjamin c
– benjamin c, Commented Oct 15, 2018 at 6:53
yes, I m using spring security

Nunyet Calçada
– Nunyet Calçada

2018-10-15 06:56:59 +00:00
Commented Oct 15, 2018 at 6:56 — Nunyet Calçada
– Nunyet Calçada, Commented Oct 15, 2018 at 6:56

William Lee · Accepted Answer · 2018-10-15 11:52:02Z

When you use ResponseEntity.ok(T body) the return type is ResponseEntity<T> as it is a shortcut method to add data to the body part of the ResponseEntity.

You need the builder object that is created via ResponseEntity.ok() with no param which returns a Builder object. You then add your data yourself on via the body method.

So your code should be like this

  @GetMapping(path = "/users/notifications", consumes = "application/json", produces = "application/json")
    public ResponseEntity<List<UserNotification>> userNotifications(
            @RequestHeader(value = "Authorization") String authHeader) {

        User user = authUserOnPath("/users/notifications", authHeader);

        List<UserNotification> menuAlertNotifications = menuService
                .getLast365DaysNotificationsByUser(user);


        return ResponseEntity.ok().cacheControl(CacheControl.maxAge(60, TimeUnit.SECONDS)).body(menuAlertNotifications);


    }

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