Refactor ping and HTTP helpers, update usages

Moved GetRealPingTime from HttpClientHelper to ConnectionHandler and refactored related methods for clarity. Removed unused and redundant HTTP helper methods. Updated DownloadService and SpeedtestService to use the new method signatures. Simplified UpdateService constructor using primary constructor syntax.

v2rayN/ServiceLib/Services/DownloadService.cs

@@ -71,7 +71,7 @@ public class DownloadService
             AllowAutoRedirect = false,
             Proxy = await GetWebProxy(blProxy)
         };
-        HttpClient client = new(webRequestHandler);
+        var client = new HttpClient(webRequestHandler);
 
         var response = await client.GetAsync(url);
         if (response.StatusCode == HttpStatusCode.Redirect && response.Headers.Location is not null)
@@ -156,7 +156,7 @@ public class DownloadService
             }
 
             using var cts = new CancellationTokenSource();
-            var result = await HttpClientHelper.Instance.GetAsync(client, url, cts.Token).WaitAsync(TimeSpan.FromSeconds(timeout), cts.Token);
+            var result = await client.GetStringAsync(url, cts.Token).WaitAsync(TimeSpan.FromSeconds(timeout), cts.Token);
             return result;
         }
         catch (Exception ex)

v2rayN/ServiceLib/Services/SpeedtestService.cs

@@ -272,7 +272,7 @@ public class SpeedtestService(Config config, Func<SpeedTestResult, Task> updateF
     private async Task<int> DoRealPing(ServerTestItem it)
     {
         var webProxy = new WebProxy($"socks5://{Global.Loopback}:{it.Port}");
-        var responseTime = await HttpClientHelper.Instance.GetRealPingTime(_config.SpeedTestItem.SpeedPingTestUrl, webProxy, 10);
+        var responseTime = await ConnectionHandler.GetRealPingTime(_config.SpeedTestItem.SpeedPingTestUrl, webProxy, 10);
 
         ProfileExManager.Instance.SetTestDelay(it.IndexId, responseTime);
         await UpdateFunc(it.IndexId, responseTime.ToString());

v2rayN/ServiceLib/Services/UpdateService.cs

@@ -1,18 +1,12 @@
 namespace ServiceLib.Services;
 
-public class UpdateService
+public class UpdateService(Config config, Func<bool, string, Task> updateFunc)
 {
-    private readonly Config? _config;
-    private readonly Func<bool, string, Task>? _updateFunc;
+    private readonly Config? _config = config;
+    private readonly Func<bool, string, Task>? _updateFunc = updateFunc;
     private readonly int _timeout = 30;
     private static readonly string _tag = "UpdateService";
 
-    public UpdateService(Config config, Func<bool, string, Task> updateFunc)
-    {
-        _config = config;
-        _updateFunc = updateFunc;
-    }
-
     public async Task CheckUpdateGuiN(bool preRelease)
     {
         var url = string.Empty;