以往常用組合方式改變網址結構：

string Url = Request.Url.Scheme + "://" + Request.Url.Authority + Request.RawUrl;

利用 .Net 的 UriBuilder 修改網址結構：

string Url = new UriBuilder("http://www.cscworm.net/") { Scheme = Uri.UriSchemeHttps, Port = 443 }.ToString();
string Url = new UriBuilder(Request.Url) { Scheme = Uri.UriSchemeHttps, Port = 443 }.ToString();