fix(ext/node): emit drained server close on next tick for Node parity (#33672)

Enables `test-http2-allow-http1` in node_compat suite.

---------

Co-authored-by: divybot <divybot@users.noreply.github.com>
Co-authored-by: Divy Srivastava <me@littledivy.com>

Author: divybot

ext/node/polyfills/_http_server.js

@@ -304,6 +304,10 @@ ServerResponse.prototype.assignSocket = function assignSocket(socket) {
     throw new ERR_HTTP_SOCKET_ASSIGNED();
   }
   socket._httpMessage = this;
+  if (socket._parent) {
+    socket._parent._httpMessage = this;
+    socket._parent._httpMessageDetached = false;
+  }
   socket.on("close", onServerResponseClose);
   this.socket = socket;
   this.emit("socket", socket);
@@ -315,6 +319,10 @@ ServerResponse.prototype.detachSocket = function detachSocket(socket) {
   socket.removeListener("close", onServerResponseClose);
   socket._httpMessage = null;
   socket._httpMessageDetached = true;
+  if (socket._parent) {
+    socket._parent._httpMessage = null;
+    socket._parent._httpMessageDetached = true;
+  }
   this.socket = null;
 };
 

ext/node/polyfills/net.ts

@@ -1859,10 +1859,25 @@ Socket.prototype._destroy = function (exception, cb) {
 
   if (this._server) {
     debug("has server");
-    this._server._connections--;
-
-    if (this._server._emitCloseIfDrained) {
-      this._server._emitCloseIfDrained();
+    const server = this._server;
+    server._connections--;
+
+    if (server._emitCloseIfDrained) {
+      if (
+        !server._handle &&
+        server._connections === 0 &&
+        this._httpMessageDetached === true &&
+        !this._httpMessage
+      ) {
+        defaultTriggerAsyncIdScope(
+          server[asyncIdSymbol],
+          nextTick,
+          _emitCloseNT,
+          server,
+        );
+      } else {
+        server._emitCloseIfDrained();
+      }
     }
   }
 };

tests/node_compat/config.jsonc

@@ -1638,6 +1638,7 @@
     "parallel/test-http.js": {},
     "parallel/test-http2-async-local-storage.js": {},
     "parallel/test-http2-alpn.js": {},
+    "parallel/test-http2-allow-http1.js": {},
     "parallel/test-http2-altsvc.js": {},
     "parallel/test-http2-autoselect-protocol.js": {},
     "parallel/test-http2-backpressure.js": {},