From 1fc00f082175e4aaceb0039f331087cae541cda7 Mon Sep 17 00:00:00 2001
From: Luigi Pinca <luigipinca@gmail.com>
Date: Wed, 16 May 2018 22:15:20 +0200
Subject: [PATCH] http: do not rely on the 'agentRemove' event

Do not use the `'agentRemove'` event to null `socket._httpMessage` as
that event is public and can be used to not keep a request in the agent.

Backport-PR-URL: https://github.com/nodejs/node/pull/20786
PR-URL: https://github.com/nodejs/node/pull/20786
Fixes: https://github.com/nodejs/node/issues/20690
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
---
 lib/_http_agent.js                      |  1 -
 lib/_http_client.js                     |  1 +
 test/parallel/test-http-agent-remove.js | 21 +++++++++++++++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 test/parallel/test-http-agent-remove.js

diff --git a/lib/_http_agent.js b/lib/_http_agent.js
index 7586a48680bb6a..5f1e56caeab981 100644
--- a/lib/_http_agent.js
+++ b/lib/_http_agent.js
@@ -277,7 +277,6 @@ function installListeners(agent, s, options) {
     s.removeListener('close', onClose);
     s.removeListener('free', onFree);
     s.removeListener('agentRemove', onRemove);
-    s._httpMessage = null;
   }
   s.on('agentRemove', onRemove);
 }
diff --git a/lib/_http_client.js b/lib/_http_client.js
index dfab2fce131122..135d31acaaec2d 100644
--- a/lib/_http_client.js
+++ b/lib/_http_client.js
@@ -470,6 +470,7 @@ function socketOnData(d) {
       // TODO(isaacs): Need a way to reset a stream to fresh state
       // IE, not flowing, and not explicitly paused.
       socket._readableState.flowing = null;
+      socket._httpMessage = null;
 
       req.emit(eventName, res, socket, bodyHead);
       req.emit('close');
diff --git a/test/parallel/test-http-agent-remove.js b/test/parallel/test-http-agent-remove.js
new file mode 100644
index 00000000000000..24fc7fcb8282fe
--- /dev/null
+++ b/test/parallel/test-http-agent-remove.js
@@ -0,0 +1,21 @@
+'use strict';
+const { mustCall } = require('../common');
+
+const http = require('http');
+const { strictEqual } = require('assert');
+
+const server = http.createServer(mustCall((req, res) => {
+  res.flushHeaders();
+}));
+
+server.listen(0, mustCall(() => {
+  const req = http.get({
+    port: server.address().port
+  }, mustCall(() => {
+    const { socket } = req;
+    socket.emit('agentRemove');
+    strictEqual(socket._httpMessage, req);
+    socket.destroy();
+    server.close();
+  }));
+}));