Support custom hostname and TLS options

fixtures/_experimentSound/localhost+2-key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDR8FlEhQ8XZctL
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+QzjTUxgXdLjtxT95ISwX83Nr
+-----END PRIVATE KEY-----

fixtures/_experimentSound/localhost+2.pem

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----
+MIIEgjCCAuqgAwIBAgIQBeTmjjlnyrCQUy06Xx/ybzANBgkqhkiG9w0BAQsFADCB
+pTEeMBwGA1UEChMVbWtjZXJ0IGRldmVsb3BtZW50IENBMT0wOwYDVQQLDDRMQVBU
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+4Jh3TJKU
+-----END CERTIFICATE-----

webdev/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 3.7.2-wip
 
-- Adds `--offline` flag [#2483](https://github.com/dart-lang/webdev/pull/2483)
+- Adds `--offline` flag [#2483](https://github.com/dart-lang/webdev/pull/2483).
+- Support the `--hostname` flag when the `--tls-cert-key` and `--tls-cert-chain` flags are present [#2588](https://github.com/dart-lang/webdev/pull/2588).
 
 ## 3.7.1
 

webdev/lib/src/serve/webdev_server.dart

@@ -206,8 +206,8 @@ class WebDevServer {
       final serverContext = SecurityContext()
         ..useCertificateChain(tlsCertChain)
         ..usePrivateKey(tlsCertKey);
-      server =
-          await HttpMultiServer.loopbackSecure(options.port, serverContext);
+      server = await HttpMultiServer.bindSecure(
+          hostname, options.port, serverContext);
     } else {
       server = await HttpMultiServer.bind(hostname, options.port);
     }

webdev/test/tls_test.dart

@@ -0,0 +1,117 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:collection/collection.dart';
+import 'package:logging/logging.dart';
+import 'package:path/path.dart' as p;
+import 'package:test/test.dart';
+import 'package:test_descriptor/test_descriptor.dart' as d;
+import 'package:test_process/test_process.dart';
+
+import 'package:webdev/src/logging.dart';
+import 'package:webdev/src/serve/utils.dart';
+
+import 'test_utils.dart';
+
+void main() {
+  group('serve app with TLS options', () {
+    // Change to true for debugging.
+    final debug = false;
+
+    final testRunner = TestRunner();
+    late String exampleDirectory;
+
+    setUpAll(() async {
+      configureLogWriter(debug);
+      await testRunner.setUpAll();
+      exampleDirectory =
+          p.absolute(p.join(p.current, '..', 'fixtures', '_experimentSound'));
+
+      final process = await TestProcess.start(
+        'dart',
+        ['pub', 'upgrade'],
+        workingDirectory: exampleDirectory,
+        environment: getPubEnvironment(),
+      );
+
+      await process.shouldExit(0);
+
+      await d
+          .file('.dart_tool/package_config.json', isNotEmpty)
+          .validate(exampleDirectory);
+      await d.file('pubspec.lock', isNotEmpty).validate(exampleDirectory);
+    });
+
+    test('listens on a loopback interface', () async {
+      final port = await findUnusedPort();
+      final args = [
+        'serve',
+        'web:$port',
+        '--hostname=0.0.0.0',
+        '--tls-cert-chain=localhost+2.pem',
+        '--tls-cert-key=localhost+2-key.pem',
+      ];
+
+      final process =
+          await testRunner.runWebDev(args, workingDirectory: exampleDirectory);
+      await expectLater(process.stdout, emitsThrough(contains('Succeeded')));
+
+      final client = HttpClient()
+        ..badCertificateCallback = (_, __, ___) => true;
+      try {
+        final request =
+            await client.getUrl(Uri.parse('https://localhost:$port'));
+        final response = await request.close();
+        expect(response.statusCode, equals(200));
+      } finally {
+        client.close(force: true);
+      }
+
+      await process.kill();
+      await process.shouldExit();
+    });
+
+    test('listens on a non-loopback interface', () async {
+      final port = await findUnusedPort();
+      final args = [
+        'serve',
+        'web:$port',
+        '--hostname=0.0.0.0',
+        '--tls-cert-chain=localhost+2.pem',
+        '--tls-cert-key=localhost+2-key.pem',
+      ];
+
+      final process =
+          await testRunner.runWebDev(args, workingDirectory: exampleDirectory);
+      await expectLater(process.stdout, emitsThrough(contains('Succeeded')));
+
+      final interfaces = await NetworkInterface.list(
+        type: InternetAddressType.IPv4,
+        includeLoopback: false,
+      );
+      final nonLoopback = interfaces.expand((i) => i.addresses).firstOrNull;
+
+      if (nonLoopback == null) {
+        Logger.root.info(
+            'No non-loopback IPv4 address available, skipping hostname test.');
+      } else {
+        final client = HttpClient()
+          ..badCertificateCallback = (_, __, ___) => true;
+        try {
+          final request = await client
+              .getUrl(Uri.parse('https://${nonLoopback.address}:$port'));
+          final response = await request.close();
+          expect(response.statusCode, equals(200));
+        } finally {
+          client.close(force: true);
+        }
+      }
+
+      await process.kill();
+      await process.shouldExit();
+    });
+  });
+}