From b1846696a4bef39e98f118687898c291776f9b82 Mon Sep 17 00:00:00 2001
From: DevSoftTech Server <info.devsofttech@gmail.com>
Date: Sat, 1 Aug 2026 16:28:27 +0530
Subject: [PATCH] Prevent stale cached IPD bill PDF responses

---
 app/Controllers/Billing/Ipd.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/app/Controllers/Billing/Ipd.php b/app/Controllers/Billing/Ipd.php
index da1eddf..8e6e6fb 100644
--- a/app/Controllers/Billing/Ipd.php
+++ b/app/Controllers/Billing/Ipd.php
@@ -990,6 +990,9 @@ class Ipd extends BaseController
         return $this->response
             ->setHeader('Content-Type', 'application/pdf')
             ->setHeader('Content-Disposition', 'inline; filename="' . $fileName . '"')
+            ->setHeader('Cache-Control', 'no-store, no-cache, must-revalidate, max-age=0')
+            ->setHeader('Pragma', 'no-cache')
+            ->setHeader('Expires', '0')
             ->setBody($mpdf->Output($fileName, 'S'));
     }