调用PHP文件的PHP页面 - 对Cache感到困惑

Question

I have a PHP page, let's say it's my landing page, landing.php.

When a user hits this php some code is run and it calls getNames.php through AJAX.

I'm pushing out a massive update to the getNames.php file and I want users to get access to the fresh file instead of the old cached file so I'm going to specify some cache headers.

If both landing.php and getNames.php are cached, do I need to specify the cache headers on both or just the getNames.php file?

As far as I am aware, AJAX caches it's requests which is why I am thinking I may need to do it on both files?

Answer 1

• In the case as you explained the AJAX call being done from landing.php and the response of ajax came from getNames.php.So there is no meaning to put cache header in getNames.php because its always give the data as your per need in AJAX response.

• So that you only need to put cache header in landing.php.When the
  user hit landing.php the cache will be clear and the new data will be loaded from the AJAX response.

• It will useful to put cache header in case when you don't make AJAX call and you do call the page getNames.php