Added automatic detection of the host type

Author: sakno

src/DotNext.Tests/Net/Http/HttpEndPointTests.cs

@@ -108,4 +108,13 @@ static bool TryParse<T>(string input, out T result)
             where T : IParsable<T>
             => T.TryParse(input, provider: null, out result);
     }
+
+    [Theory]
+    [InlineData("192.168.0.1", AddressFamily.InterNetwork)]
+    [InlineData("2001:0db8:0000:0000:0000:8a2e:0370:7334", AddressFamily.InterNetworkV6)]
+    [InlineData("host", AddressFamily.Unspecified)]
+    public static void AutoDetectAddressFamily(string hostName, AddressFamily expected)
+    {
+        Equal(expected, new HttpEndPoint(hostName, 8080, false).AddressFamily);
+    }
 }

src/DotNext/Net/Http/HttpEndPoint.cs

@@ -30,7 +30,7 @@ public HttpEndPoint(Uri uri)
     /// <param name="secure"><see langword="true"/> for HTTPS; <see langword="false"/> for HTTP.</param>
     /// <param name="family">The type of the host name.</param>
     public HttpEndPoint(string hostName, int port, bool secure, AddressFamily family = AddressFamily.Unspecified)
-        : base(hostName, port, family)
+        : base(hostName, port, family is AddressFamily.Unspecified ? ToAddressFamily(hostName) : family)
         => IsSecure = secure;
 
     /// <summary>
@@ -69,6 +69,8 @@ private static int GetPort(Uri uri, out bool secure)
         _ => AddressFamily.Unspecified,
     };
 
+    private static AddressFamily ToAddressFamily(string? hostName) => ToAddressFamily(Uri.CheckHostName(hostName));
+
     /// <summary>
     /// Gets a value indicating that HTTP over TLS should be used (HTTPS).
     /// </summary>