Changing GetRemoteIpAddress() to resolve clean IPv4 or IPv6 addresses from headers

UnitTests/AspNetCore/Extensions/HttpContextExtensionsTests.cs

@@ -188,6 +188,25 @@ namespace UnitTests.AspNetCore.Extensions
 			Assert.AreEqual(header, result);
 		}
 
+		[TestMethod]
+		public void ShouldReturnV4AddressOnMapped()
+		{
+			// arrange
+			remote = IPAddress.Parse("1.2.3.4");
+			var header = IPAddress.Parse("::ffff:127.0.0.1");
+			requestHeaders.Add("X-Forwarded-For", "::ffff:127.0.0.1");
+
+			var context = GetContext();
+
+			// act
+			var result = context.GetRemoteIpAddress();
+
+			// assert
+			Assert.AreNotEqual(remote, result);
+			Assert.AreNotEqual(header, result);
+			Assert.AreEqual(header.MapToIPv4(), result);
+		}
+
 		#endregion RemoteAddres
 
 		#region Local Request