摘要:取得用戶端可用的URL
	方法一
	ResolveUrl("~/ckeditor/ckeditor.js")
	方法二 (取得絕對路徑 C:\~~~~   )
	string address = "~/update/";
	Server.MapPath(address)
	//取得完整網址
	Response.Write("http://" +  Request.ServerVariables["SERVER_NAME"].ToString() + ResolveUrl("news.aspx"));
	
	網址:http://localhost:1897/News/Press/Content.aspx/123?id=1#toc
	Request.ApplicationPath  /
	Request.PhysicalPath   D:\Projects\Solution\web\News\Press\Content.aspx
	System.IO.Path.GetDirectoryName(Request.PhysicalPath)   D:\Projects\Solution\web\News\Press
	Request.PhysicalApplicationPath  D:\Projects\Solution\web\
	System.IO.Path.GetFileName(Request.PhysicalPath)   Content.aspx
	Request.CurrentExecutionFilePath  /News/Press/Content.aspx
	Request.FilePath     /News/Press/Content.aspx
	Request.Path      /News/Press/Content.aspx/123
	Request.RawUrl      /News/Press/Content.aspx/123?id=1
	Request.Url.AbsolutePath   /News/Press/Content.aspx/123
	Request.Url.AbsoluteUri   http://localhost:1897/News/Press/Content.aspx/123?id=1
	Request.Url.Scheme   http
	Request.Url.Host   localhost
	Request.Url.Port   1897
	Request.Url.Authority  localhost:1897
	Request.Url.LocalPath   /News/Press/Content.aspx/123
	Request.PathInfo /123
	Request.Url.PathAndQuery  /News/Press/Content.aspx/123?id=1
	Request.Url.Query   ?id=1
	Request.Url.Fragment  
	Request.Url.Segments