feat: upate secure_server/simple_secure_server.dart

.gitignore

@@ -1,6 +1,7 @@
 # ---> Dart
 # See https://www.dartlang.org/guides/libraries/private-files
 
+.idea/
 # Files and directories created by pub
 .dart_tool/
 .packages

secure_server/simple_secure_server.dart

@@ -5,19 +5,22 @@ String serverKey = 'server_key.pem';
 
 Future main() async {
   var serverContext = SecurityContext();
-  serverContext.useCertificateChain(certificateChain);
-  serverContext.usePrivateKey(serverKey, password: 'dartdart');
+  serverContext
+    ..useCertificateChain(certificateChain)
+    ..usePrivateKey(serverKey, password: 'dartdart');
 
   var server = await HttpServer.bindSecure(
     '0.0.0.0',
     8443,
     serverContext,
   );
-  print('Listening on localhost:${server.port}');
+  print('[INFO] Listening on localhost:${server.port} for HTTPS requests');
   await for (HttpRequest request in server) {
-    print('Got request for ${request.uri.path}');
+    print('[INFO] Got request for ${request.uri.path}');
     request.response
-      ..write('Hello, world!')
+      ..statusCode = 200
+      ..headers.add("content-type", "text/plain; charset=utf-8")
+      ..write('Hello, world!\n')
       ..close();
   }
 }