add support for system proxy

WaiterLibrary/Global.cs

@@ -2,19 +2,33 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using System.Text;
 using System.Threading.Tasks;
 
 namespace WaiterLibrary
 {
     public static class Global
     {
+        static Global()
+        {
+            var systemProxy = WebRequest.GetSystemWebProxy();
+            var httpProxy = new WebProxy(systemProxy.GetProxy(new Uri("https://google.com")));
+            var httpHandler = new HttpClientHandler();
+            httpHandler.Proxy = httpProxy;
+            //httpHandler.SslProtocols = System.Security.Authentication.SslProtocols.Tls13;
+            httpHandler.UseProxy = true;
+            var httpClient = new HttpClient(httpHandler, true);
+            ChannelOptions = new GrpcChannelOptions();
+            ChannelOptions.HttpClient = httpClient;
+        }
         private static GrpcChannel? _channel;
 
         public static string ServerURL = "https://theam-grpc.gyx.moe";
+        public static GrpcChannelOptions ChannelOptions;
         public static GrpcChannel Channel
         {
-            get => _channel ??= GrpcChannel.ForAddress(ServerURL);
+            get => _channel ??= GrpcChannel.ForAddress(ServerURL, ChannelOptions);
             set => _channel = value;
         }
     }