Reduce DefaultPooledConnectionIdleTimeout default (#52687)

* Reduce DefaultPooledConnectionIdleTimeout default

- Change DefaultPooledConnectionIdleTimeout from 120 seconds to 60 seconds
- This should reduce the occurrence of socket errors when connected to IIS or Kestrel

Author: halter73

src/libraries/Common/src/System/Net/Http/HttpHandlerDefaults.cs

@@ -25,7 +25,7 @@ internal static partial class HttpHandlerDefaults
         public const bool DefaultUseDefaultCredentials = false;
         public const bool DefaultCheckCertificateRevocationList = false;
         public static readonly TimeSpan DefaultPooledConnectionLifetime = Timeout.InfiniteTimeSpan;
-        public static readonly TimeSpan DefaultPooledConnectionIdleTimeout = TimeSpan.FromMinutes(2);
+        public static readonly TimeSpan DefaultPooledConnectionIdleTimeout = TimeSpan.FromMinutes(1);
         public static readonly TimeSpan DefaultExpect100ContinueTimeout = TimeSpan.FromSeconds(1);
         public static readonly TimeSpan DefaultConnectTimeout = Timeout.InfiniteTimeSpan;
     }

src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.cs

@@ -1774,7 +1774,7 @@ public void PooledConnectionIdleTimeout_GetSet_Roundtrips()
         {
             using (var handler = new SocketsHttpHandler())
             {
-                Assert.Equal(TimeSpan.FromMinutes(2), handler.PooledConnectionIdleTimeout);
+                Assert.Equal(TimeSpan.FromMinutes(1), handler.PooledConnectionIdleTimeout);
 
                 handler.PooledConnectionIdleTimeout = Timeout.InfiniteTimeSpan;
                 Assert.Equal(Timeout.InfiniteTimeSpan, handler.PooledConnectionIdleTimeout);
@@ -1957,7 +1957,7 @@ await Assert.ThrowsAnyAsync<Exception>(() =>
                 Assert.Equal(int.MaxValue, handler.MaxConnectionsPerServer);
                 Assert.Equal(64, handler.MaxResponseHeadersLength);
                 Assert.False(handler.PreAuthenticate);
-                Assert.Equal(TimeSpan.FromMinutes(2), handler.PooledConnectionIdleTimeout);
+                Assert.Equal(TimeSpan.FromMinutes(1), handler.PooledConnectionIdleTimeout);
                 Assert.Equal(Timeout.InfiniteTimeSpan, handler.PooledConnectionLifetime);
                 Assert.NotNull(handler.Properties);
                 Assert.Null(handler.Proxy);