public void MediaTypesTest()
{
const string jpg = "https://i.ytimg.com/vi/r45a-l9Gqdk/hqdefault.jpg";
var i = MediaTypes.Identify(jpg);
Assert.True(Network.IsUri(jpg, out var u));
Assert.True(MediaTypes.GetExtensions(i).Contains("jpe"));
Assert.True(MediaTypes.GetTypeComponent(i) == "image");
Assert.True(MediaTypes.GetSubTypeComponent(i) == "jpeg");
}