http: emit close on socket re-use

lib/_http_client.js

@@ -607,7 +607,7 @@ function responseKeepAlive(req) {
   const asyncId = socket._handle ? socket._handle.getAsyncId() : undefined;
   // Mark this socket as available, AFTER user-added end
   // handlers have a chance to run.
-  defaultTriggerAsyncIdScope(asyncId, process.nextTick, emitFreeNT, socket);
+  defaultTriggerAsyncIdScope(asyncId, process.nextTick, emitFreeNT, req);
 }
 
 function responseOnEnd() {
@@ -629,7 +629,7 @@ function responseOnEnd() {
         socket.end();
     }
     assert(!socket.writable);
-  } else if (req.finished) {
+  } else if (req.finished && !this.aborted) {
     // We can assume `req.finished` means all data has been written since:
     // - `'responseOnEnd'` means we have been assigned a socket.
     // - when we have a socket we write directly to it without buffering.
@@ -646,8 +646,15 @@ function requestOnPrefinish() {
     responseKeepAlive(req);
 }
 
-function emitFreeNT(socket) {
-  socket.emit('free');
+function emitFreeNT(req) {
+  req.emit('close');
+  if (req.res) {
+    req.res.emit('close');
+  }
+
+  if (req.socket) {
+    req.socket.emit('free');
+  }
 }
 
 function tickOnSocket(req, socket) {
@@ -717,6 +724,7 @@ function onSocketNT(req, socket) {
     if (!req.agent) {
       socket.destroy();
     } else {
+      req.emit('close');
       socket.emit('free');
     }
   } else {

test/parallel/test-http-client-agent-abort-close-event.js

@@ -0,0 +1,23 @@
+'use strict';
+const common = require('../common');
+const http = require('http');
+
+const server = http.createServer(common.mustNotCall());
+
+const keepAliveAgent = new http.Agent({ keepAlive: true });
+
+server.listen(0, common.mustCall(() => {
+  const req = http.get({
+    port: server.address().port,
+    agent: keepAliveAgent
+  });
+
+  req
+    .on('socket', common.mustNotCall())
+    .on('response', common.mustNotCall())
+    .on('close', common.mustCall(() => {
+      server.close();
+      keepAliveAgent.destroy();
+    }))
+    .abort();
+}));

test/parallel/test-http-client-agent-end-close-event.js

@@ -0,0 +1,27 @@
+'use strict';
+const common = require('../common');
+const http = require('http');
+
+const server = http.createServer(common.mustCall((req, res) => {
+  res.end('hello');
+}));
+
+const keepAliveAgent = new http.Agent({ keepAlive: true });
+
+server.listen(0, common.mustCall(() => {
+  const req = http.get({
+    port: server.address().port,
+    agent: keepAliveAgent
+  });
+
+  req
+    .on('response', common.mustCall((res) => {
+      res
+        .on('close', common.mustCall(() => {
+          server.close();
+          keepAliveAgent.destroy();
+        }))
+        .on('data', common.mustCall());
+    }))
+    .end();
+}));