http: do not rely on the 'agentRemove' event

lib/_http_agent.js

@@ -276,7 +276,6 @@ function installListeners(agent, s, options){
  s.removeListener('close', onClose);
  s.removeListener('free', onFree);
  s.removeListener('agentRemove', onRemove);
- s._httpMessage = null;
  }
  s.on('agentRemove', onRemove);
 }

lib/_http_client.js

@@ -467,6 +467,7 @@ function socketOnData(d){
  socket.removeListener('close', socketCloseListener);
  socket.removeListener('error', socketErrorListener);
 
+ socket._httpMessage = null;
  socket.readableFlowing = null;
 
  req.emit(eventName, res, socket, bodyHead);

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();
+ }));
+}));