[wp-trac] [WordPress Trac] #51831: WP REST API and Caching Issue

[WordPress Trac]

#51831: WP REST API and Caching Issue
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 Reporter:  mguenter      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:  5.5.3
 Severity:  normal        |   Keywords:
  Focuses:  rest-api      |
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 ''A follow-up to https://core.trac.wordpress.org/ticket/39861, cause I can
 not change the WordPress version to 5.5.3.''

 Hey @joehoyle and @lukecavanagh,

 I just came across this ticket because I have a similar issue. We have
 implemented a dashboard in a WordPress submenu page. Imagine the following
 scenario:

 1. Open the dashboard
 2. JavaScript is fetching data via `GET` from a WP REST API endpoint
 3. Click on another submenu, e.g. media library
 4. Use the back button from the browser
 5. Check the network log and you will see, that the WP REST API request
 got cached (`200 OK (from disk cache)`)

 [[Image(https://i.imgur.com/9z0i3bT.png)]]

 Tested on Chrome, but I think this happens on all browsers.

 **How can this be fixed?** Using the following header disallows the
 browsers to cache the response:

 `Cache-Control: no-cache, no-store, must-revalidate, max-age=0`

 Add `no-store` directive, see also https://developer.mozilla.org/en-
 US/docs/Web/HTTP/Headers/Cache-Control and
 https://www.mixmax.com/engineering/chrome-back-button-cache-no-store/

 > The solution? Add the no-store cache directive. It tells the browser to
 really not store anything at > all. So this works, and clicking the back
 button in Chrome will never serve up cached content: [...]

 If you fix this, you need to be careful, because the directive should
 probably only be added on WP REST API calls.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51831>
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