http2: close idle connections when allowHTTP1 is true

Fixes: nodejs#51493

lib/internal/http2/core.js

@@ -59,7 +59,7 @@ const {
   kIncomingMessage,
   _checkIsHttpToken: checkIsHttpToken,
 } = require('_http_common');
-const { kServerResponse } = require('_http_server');
+const { kServerResponse, Server: HttpServer, setupConnectionsTracking } = require('_http_server');
 const JSStreamSocket = require('internal/js_stream_socket');
 
 const {
@@ -3180,13 +3180,22 @@ class Http2SecureServer extends TLSServer {
     this[kOptions] = options;
     this.timeout = 0;
     this.on('newListener', setupCompat);
+    if (options.allowHTTP1 === true) {
+      this.headersTimeout = 0;
+      this.requestTimeout = 0;
+      this.on('listening', setupConnectionsTracking);
+    }
     if (typeof requestListener === 'function')
       this.on('request', requestListener);
     this.on('tlsClientError', onErrorSecureServerSession);
   }
 
   setTimeout(msecs, callback) {
     this.timeout = msecs;
+    if (this[kOptions].allowHTTP1 === true) {
+      this.headersTimeout = msecs;
+      this.requestTimeout = msecs;
+    }
     if (callback !== undefined) {
       validateFunction(callback, 'callback');
       this.on('timeout', callback);
@@ -3199,6 +3208,13 @@ class Http2SecureServer extends TLSServer {
     validateSettings(settings);
     this[kOptions].settings = { ...this[kOptions].settings, ...settings };
   }
+
+  close() {
+    if (this[kOptions].allowHTTP1 === true) {
+      FunctionPrototypeCall(HttpServer.prototype.closeIdleConnections, this);
+    }
+    ReflectApply(TLSServer.prototype.close, this, arguments);
+  }
 }
 
 class Http2Server extends NETServer {