function custom_http_headers() {
if (is_singular()) {
// For dynamic content (e.g., single posts, pages)
header('Cache-Control: no-cache, no-store, must-revalidate');
header('Pragma: no-cache');
header('Expires: 0');
} else {
// For static assets (e.g., images, CSS, JS)
header('Cache-Control: public, max-age=31536000, immutable');
header('ETag: "static-content-version-1"');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', filemtime(__FILE__)) . ' GMT');
}
}
add_action('send_headers', 'custom_http_headers');
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