backward compatibilty tests

Author: amyssnippet

lib/internal/http2/core.js

@@ -3259,8 +3259,10 @@ function connectionListener(socket) {
   if (socket.alpnProtocol === false || socket.alpnProtocol === 'http/1.1') {
     // Fallback to HTTP/1.1
     if (options.allowHTTP1 === true) {
-      socket.server[kIncomingMessage] = options.Http1IncomingMessage;
-      socket.server[kServerResponse] = options.Http1ServerResponse;
+      socket.server[kIncomingMessage] =
+        options.http1Options.IncomingMessage || http.IncomingMessage;
+      socket.server[kServerResponse] =
+        options.http1Options.ServerResponse || http.ServerResponse;
       return httpConnectionListener.call(this, socket);
     }
     // Let event handler deal with the socket
@@ -3342,9 +3344,18 @@ function initializeOptions(options) {
     options.unknownProtocolTimeout = 10000;
 
 
-  // Used only with allowHTTP1
-  options.Http1IncomingMessage ||= http.IncomingMessage;
-  options.Http1ServerResponse ||= http.ServerResponse;
+  // Initialize http1Options bag for HTTP/1 fallback when allowHTTP1 is true.
+  // This bag is passed to storeHTTPOptions() to configure HTTP/1 server
+  // behavior (timeouts, IncomingMessage/ServerResponse classes, etc.).
+  options.http1Options = { ...options.http1Options };
+
+  // Backward compat: migrate deprecated top-level Http1 options (DEP0201)
+  if (options.Http1IncomingMessage !== undefined) {
+    options.http1Options.IncomingMessage ??= options.Http1IncomingMessage;
+  }
+  if (options.Http1ServerResponse !== undefined) {
+    options.http1Options.ServerResponse ??= options.Http1ServerResponse;
+  }
 
   options.Http2ServerRequest ||= Http2ServerRequest;
   options.Http2ServerResponse ||= Http2ServerResponse;
@@ -3392,7 +3403,7 @@ class Http2SecureServer extends TLSServer {
     this.timeout = 0;
     this.on('newListener', setupCompat);
     if (options.allowHTTP1 === true) {
-      storeHTTPOptions.call(this, options);
+      storeHTTPOptions.call(this, { ...options, ...options.http1Options });
       this.shouldUpgradeCallback = function() {
         return this.listenerCount('upgrade') > 0;
       };