Cache-busting JSON in PHP with filemtime

The blog listing loads articles via fetch('posts.json') . Problem: the browser caches this file. When you publish a new article, visitors keep seeing the old list until they manually clear their cache — which they never do. Why the browser caches the JSON Without an explicit Cache-Control directive, Apache applies a heuristic: it estimates a cache duration from the file's Last-Modified header. In practice, browsers can keep the file cached for several hours, or even several days depending on the