tweaks

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/http/init.dart

@@ -92,6 +92,7 @@ class Request {
    * config it and create
    */
   Request._internal() {
+    final enableHttp2 = Pref.enableHttp2;
     //BaseOptions、Options、RequestOptions 都可以配置参数，优先级别依次递增，且可以根据优先级别覆盖参数
     BaseOptions options = BaseOptions(
       //请求基地址,可以包含子路径
@@ -103,7 +104,7 @@ class Request {
       //Http请求头.
       headers: {
         'user-agent': 'Dart/3.6 (dart:io)', // Http2Adapter不会自动添加标头
-        if (!Pref.enableHttp2) 'connection': 'keep-alive',
+        if (!enableHttp2) 'connection': 'keep-alive',
         'accept-encoding': 'br,gzip',
       },
       responseDecoder: _responseDecoder, // Http2Adapter没有自动解压
@@ -127,31 +128,25 @@ class Request {
               ..idleTimeout = const Duration(seconds: 15)
               ..autoUncompress = false
               ..findProxy = ((_) => 'PROXY $systemProxyHost:$systemProxyPort')
-              ..badCertificateCallback =
-                  (X509Certificate cert, String host, int port) => true
+              ..badCertificateCallback = (cert, host, port) => true
           : () => HttpClient()
               ..idleTimeout = const Duration(seconds: 15)
               ..autoUncompress = false, // Http2Adapter没有自动解压, 统一行为
     );
 
-    late final Uri proxy;
-    if (enableSystemProxy) {
-      proxy = Uri(
-        scheme: 'http',
-        host: systemProxyHost,
-        port: systemProxyPort,
-      );
-    }
-
     dio = Dio(options)
-      ..httpClientAdapter = Pref.enableHttp2
+      ..httpClientAdapter = enableHttp2
           ? Http2Adapter(
               ConnectionManager(
                 idleTimeout: const Duration(seconds: 15),
                 onClientCreate: enableSystemProxy
                     ? (_, config) {
                         config
-                          ..proxy = proxy
+                          ..proxy = Uri(
+                            scheme: 'http',
+                            host: systemProxyHost,
+                            port: systemProxyPort,
+                          )
                           ..onBadCertificate = (_) => true;
                       }
                     : Pref.badCertificateCallback