if-def less version

Author: marek-safar

src/libraries/System.Net.Http/src/System.Net.Http.csproj

@@ -13,7 +13,6 @@
     <DefineConstants>$(DefineConstants);TARGET_BROWSER</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetsWindows)' == 'true' or '$(TargetsLinux)' == 'true' or '$(TargetsFreeBSD)' == 'true' or '$(TargetsOSX)' == 'true'">
-    <DefineConstants>$(DefineConstants);HTTP3_SUPPORTED</DefineConstants>
     <SupportsQuic>true</SupportsQuic>
   </PropertyGroup>
   <!-- ILLinker settings -->
@@ -219,6 +218,12 @@
     <Compile Include="System\Net\Http\SocketsHttpHandler\Http3ConnectionException.cs" />
     <Compile Include="System\Net\Http\SocketsHttpHandler\Http3ProtocolException.cs" />
     <Compile Include="System\Net\Http\SocketsHttpHandler\Http3RequestStream.cs" />
+    <Compile Include="System\Net\Http\SocketsHttpHandler\HttpConnectionPool.Quic.cs" />
+    <Compile Include="System\Net\Http\SocketsHttpHandler\HttpConnectionSettings.Quic.cs" />
+  </ItemGroup>
+  <ItemGroup Condition="'$(SupportsQuic)' != 'true' and '$(TargetsBrowser)' != 'true'">
+    <Compile Include="System\Net\Http\SocketsHttpHandler\HttpConnectionPool.NoQuic.cs" />
+    <Compile Include="System\Net\Http\SocketsHttpHandler\HttpConnectionSettings.NoQuic.cs" />
   </ItemGroup>
   <!-- Header support -->
   <ItemGroup>

src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectHelper.cs

@@ -100,23 +100,6 @@ private static async ValueTask<SslStream> EstablishSslConnectionAsyncCore(bool a
             return sslStream;
         }
 
-#if HTTP3_SUPPORTED
-        public static async ValueTask<QuicConnection> ConnectQuicAsync(QuicImplementationProvider quicImplementationProvider, DnsEndPoint endPoint, SslClientAuthenticationOptions? clientAuthenticationOptions, CancellationToken cancellationToken)
-        {
-            QuicConnection con = new QuicConnection(quicImplementationProvider, endPoint, clientAuthenticationOptions);
-            try
-            {
-                await con.ConnectAsync(cancellationToken).ConfigureAwait(false);
-                return con;
-            }
-            catch (Exception ex)
-            {
-                con.Dispose();
-                throw CreateWrappedException(ex, endPoint.Host, endPoint.Port, cancellationToken);
-            }
-        }
-#endif
-
         internal static Exception CreateWrappedException(Exception error, string host, int port, CancellationToken cancellationToken)
         {
             return CancellationHelper.ShouldWrapInOperationCanceledException(error, cancellationToken) ?

src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnectionPool.NoQuic.cs

@@ -0,0 +1,24 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace System.Net.Http
+{
+    internal sealed partial class HttpConnectionPool
+    {
+        private static bool IsHttp3Enabled => false;
+
+        private ValueTask<(HttpConnectionBase? connection, bool isNewConnection, HttpResponseMessage? failureResponse)>?
+            GetHttp3ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken) => null;
+
+        private bool IsAltSvcBlocked(HttpAuthority authority) => false;
+
+        private bool ProcessAltSvc(HttpResponseMessage response, HttpConnectionBase? connection) => false;
+
+        public void OnNetworkChanged()
+        {
+        }
+    }
+}