http: onFinish will not be triggered again when finished

PR-URL: #35845
Fixes: #35833
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: rickyes

lib/_http_outgoing.js

@@ -814,6 +814,12 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
   }
 
   if (chunk) {
+    if (this.finished) {
+      onError(this,
+              new ERR_STREAM_WRITE_AFTER_END(),
+              typeof callback !== 'function' ? nop : callback);
+      return this;
+    }
     write_(this, chunk, encoding, null, true);
   } else if (this.finished) {
     if (typeof callback === 'function') {

test/parallel/test-http-outgoing-end-multiple.js

@@ -3,9 +3,17 @@ const common = require('../common');
 const assert = require('assert');
 const http = require('http');
 
+const onWriteAfterEndError = common.mustCall((err) => {
+  assert.strictEqual(err.code, 'ERR_STREAM_WRITE_AFTER_END');
+}, 2);
+
 const server = http.createServer(common.mustCall(function(req, res) {
   res.end('testing ended state', common.mustCall());
-  res.end(common.mustCall());
+  res.end(common.mustCall((err) => {
+    assert.strictEqual(err.code, 'ERR_STREAM_ALREADY_FINISHED');
+  }));
+  res.end('end', onWriteAfterEndError);
+  res.on('error', onWriteAfterEndError);
   res.on('finish', common.mustCall(() => {
     res.end(common.mustCall((err) => {
       assert.strictEqual(err.code, 'ERR_STREAM_ALREADY_FINISHED');