title: Zoom in Flutter with flutter_inappwebview
body: <p>I use the Code from one answer <a href="https://stackoverflow.com/questions/57253385/webview-flutter-failed-to-validate-the-certificate-chain-ssl-handshake-failed">webview_flutter &quot;Failed to validate the certificate chain&quot; SSL handshake failed error</a></p>
  
  <pre><code>
  import 'package:flutter/material.dart';
  
  import 'package:flutter_inappwebview/flutter_inappwebview.dart';
  
  Future main() async {
   runApp(new MyApp());
  }
  
  class MyApp extends StatefulWidget {
   @override
   _MyAppState createState() =&gt; new _MyAppState();
  }
  
  class _MyAppState extends State&lt;MyApp&gt; {
  
   @override
   void initState() {
     super.initState();
   }
  
   @override
   void dispose() {
     super.dispose();
   }
  
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
         home: InAppWebViewPage()
     );
   }
  } 
  
  class InAppWebViewPage extends StatefulWidget {
   @override
   _InAppWebViewPageState createState() =&gt; new _InAppWebViewPageState();
  }
  
  class _InAppWebViewPageState extends State&lt;InAppWebViewPage&gt; {
   InAppWebViewController webView;
  
   @override
   Widget build(BuildContext context) {
     return Scaffold(
         appBar: AppBar(
             title: Text("InAppWebView")
         ),
         body: Container(
             child: Column(children: &lt;Widget&gt;[
               Expanded(
                 child: Container(
                   child: InAppWebView(
                     initialUrl: "https://myUrl",
                     initialHeaders: {},
                     initialOptions: InAppWebViewWidgetOptions(
                         inAppWebViewOptions: InAppWebViewOptions(
                           debuggingEnabled: true,
                         ),
                     ),
                     onWebViewCreated: (InAppWebViewController controller) {
                       webView = controller;
                     },
                     onLoadStart: (InAppWebViewController controller, String url) {
  
                     },
                     onLoadStop: (InAppWebViewController controller, String url) {
  
                     },
                     onReceivedServerTrustAuthRequest: (InAppWebViewController controller, ServerTrustChallenge challenge) async {
                       return ServerTrustAuthResponse(action: ServerTrustAuthResponseAction.PROCEED);
                     },
                   ),
                 ),
               ),
             ]))
     );
   }
  }
  
  </code></pre>
  
  <p>I tried to use the function to zoom, but flutter doens´t know the option. How can I add it to this function? I need these function for Android and iOS.</p>