http: defer reentrant execution of Parser::Execute

PR-URL: https://github.com/nodejs/node/pull/43369
Fixes: https://github.com/nodejs/node/issues/39671
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

test/parallel/test-http-parser-multiple-execute.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const { request } = require('http');
+const { Duplex } = require('stream');
+
+let socket;
+
+function createConnection(...args) {
+  socket = new Duplex({
+    read() {},
+    write(chunk, encoding, callback) {
+      if (chunk.toString().includes('\r\n\r\n')) {
+        this.push('HTTP/1.1 100 Continue\r\n\r\n');
+      }
+
+      callback();
+    }
+  });
+
+  return socket;
+}
+
+const req = request('http://localhost:8080', { createConnection });
+
+req.on('information', common.mustCall(({ statusCode }) => {
+  assert.strictEqual(statusCode, 100);
+  socket.push('HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n');
+  socket.push(null);
+}));
+
+req.on('response', common.mustCall(({ statusCode }) => {
+  assert.strictEqual(statusCode, 200);
+}));
+
+req.end();