From 1d4c9a5b438f71018f129ccf0b0d394570d4a7d2 Mon Sep 17 00:00:00 2001
From: KhoaZero123 <khoazero123@gmail.com>
Date: Thu, 8 Sep 2022 16:10:12 +0700
Subject: [PATCH] Support must-revalidate

---
 index.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/index.js b/index.js
index 89afd7e..5765e15 100644
--- a/index.js
+++ b/index.js
@@ -141,6 +141,10 @@ function SendStream (req, path, options) {
     ? Boolean(opts.immutable)
     : false
 
+  this._revalidate = opts.revalidate !== undefined
+    ? Boolean(opts.revalidate)
+    : false
+
   this._index = opts.index !== undefined
     ? normalizeList(opts.index, 'index option')
     : ['index.html']
@@ -866,6 +870,10 @@ SendStream.prototype.setHeader = function setHeader (path, stat) {
       cacheControl += ', immutable'
     }
 
+    if (this._revalidate) {
+      cacheControl += ', must-revalidate'
+    }
+
     debug('cache-control %s', cacheControl)
     res.setHeader('Cache-Control', cacheControl)
   }