test: fix test cases

Author: WeihanLi

src/Middleware/HttpOverrides/src/ForwardedHeadersOptions.cs

@@ -84,7 +84,10 @@ public class ForwardedHeadersOptions
     /// <summary>
     /// Address ranges of known proxies to accept forwarded headers from.
     /// </summary>
-    public IList<IPNetwork> KnownNetworks { get; } = new List<IPNetwork>() { new IPNetwork(IPAddress.Loopback, 8) };
+    public IList<IPNetwork> KnownNetworks { get; } = new List<IPNetwork>()
+    {
+        IPNetwork.Parse("127.0.0.0/8")
+    };
 
     /// <summary>
     /// The allowed values from x-forwarded-host. If the list is empty then all hosts are allowed.

src/Middleware/HttpOverrides/test/ForwardedHeadersMiddlewareTest.cs

@@ -1072,7 +1072,7 @@ public async Task PartiallyEnabledForwardsPartiallyChangesRequest()
     [InlineData("22.33.44.55,::ffff:172.123.142.121", "172.123.142.121", "", "22.33.44.55")]
     [InlineData("22.33.44.55,::ffff:172.123.142.121", "::ffff:172.123.142.121", "", "22.33.44.55")]
     [InlineData("22.33.44.55,::ffff:172.123.142.121,172.32.24.23", "", "172.0.0.0/8", "22.33.44.55")]
-    [InlineData("2a00:1450:4009:802::200e,2a02:26f0:2d:183::356e,::ffff:172.123.142.121,172.32.24.23", "", "172.0.0.0/8,2a02:26f0:2d:183::1/64", "2a00:1450:4009:802::200e")]
+    [InlineData("2a00:1450:4009:802::200e,2a02:26f0:2d:183::356e,::ffff:172.123.142.121,172.32.24.23", "", "172.0.0.0/8,2a02:26f0:2d:183::/64", "2a00:1450:4009:802::200e")]
     [InlineData("22.33.44.55,2a02:26f0:2d:183::356e,::ffff:127.0.0.1", "2a02:26f0:2d:183::356e", "", "22.33.44.55")]
     public async Task XForwardForIPv4ToIPv6Mapping(string forHeader, string knownProxies, string knownNetworks, string expectedRemoteIp)
     {