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wp-content/plugins/mailpoet/lib/Util/Headers.php

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+<?php declare(strict_types = 1);
+
+namespace MailPoet\Util;
+
+if (!defined('ABSPATH')) exit;
+
+
+use MailPoet\WP\Functions as WPFunctions;
+
+class Headers {
+  public static function setNoCacheHeaders(): void {
+    $wp = WPFunctions::get();
+    if ($wp->headersSent()) {
+      return;
+    }
+
+    // Set default no-cache headers:
+    header('Cache-Control: no-cache, no-store, must-revalidate'); // HTTP 1.1+
+    header('Pragma: no-cache'); // HTTP 1.0
+    header('Expires: 0'); // proxies
+    header('X-Cache-Enabled: False'); // SG Optimizer on SiteGround
+    header('X-LiteSpeed-Cache-Control: no-cache'); // LiteSpeed server
+
+    // Use WP-native nocache_headers(). This can override the defaults above.
+    $wp->nocacheHeaders();
+  }
+}