From 63febeceb86f3b113df4680d4d95b9b8dc2e95cd Mon Sep 17 00:00:00 2001
From: Swizz <swizz@users.noreply.github.com>
Date: Wed, 13 May 2020 10:45:17 +0200
Subject: [PATCH 1/2] next callback should use the response payload

---
 plugin.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugin.js b/plugin.js
index bbbd5d6..65dc8ca 100644
--- a/plugin.js
+++ b/plugin.js
@@ -48,7 +48,7 @@ function etagOnSend (req, res, payload, next) {
     { id: etag, segment: this.cacheSegment },
     true,
     res._etagLife,
-    next
+    (err) => next(err, payload)
   )
 }
 

From 1987d06569b4a866f57dd074490de7ee02c237a1 Mon Sep 17 00:00:00 2001
From: tiswrt <tim.siewert@mailbox.org>
Date: Mon, 1 Mar 2021 14:20:09 +0100
Subject: [PATCH 2/2] add test

---
 test/cache.test.js | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/test/cache.test.js b/test/cache.test.js
index 24a9c6c..841636c 100644
--- a/test/cache.test.js
+++ b/test/cache.test.js
@@ -138,3 +138,36 @@ test('etag cache life is customizable', (t) => {
       .on('error', t.threw)
   })
 })
+
+test('returns response payload', (t) => {
+  t.plan(1)
+  const instance = fastify()
+  instance.register(plugin)
+
+  instance.get('/one', (req, reply) => {
+    reply
+      .etag('123456', 300)
+      .send({ hello: 'world' })
+  })
+
+  instance.listen(0, (err) => {
+    if (err) t.threw(err)
+    instance.server.unref()
+    const portNum = instance.server.address().port
+    const opts = {
+      host: '127.0.0.1',
+      port: portNum,
+      path: '/one'
+    }
+    http
+      .get(opts, (res) => {
+        let payload = ''
+        res.on('data', (chunk) => {
+          payload += chunk
+        }).on('end', () => {
+          t.same(JSON.parse(payload), { hello: 'world' })
+        }).on('error', t.threw)
+      })
+      .on('error', t.threw)
+  })
+})