> Console.WriteLine(new Uri(new Uri("https://www.baidu.com/api"), "/gateway/code"));
https://www.baidu.com/gateway/code
> Console.WriteLine(new Uri(new Uri("https://www.baidu.com/api"), "gateway/code"));
https://www.baidu.com/gateway/code
> Console.WriteLine(new Uri(new Uri("https://www.baidu.com/api/"), "/gateway/code"));
https://www.baidu.com/gateway/code
> Console.WriteLine(new Uri(new Uri("https://www.baidu.com/api/"), "gateway/code"));
https://www.baidu.com/api/gateway/code
> Console.WriteLine(new Uri(new Uri("https://www.baidu.com"), "gateway/code"));
https://www.baidu.com/gateway/code
> Console.WriteLine(new Uri(new Uri("https://www.baidu.com/"), "gateway/code"));
https://www.baidu.com/gateway/code
> Console.WriteLine(new Uri(new Uri("https://www.baidu.com/"), "/gateway/code"));
https://www.baidu.com/gateway/code