CanonicalizeUrl

The CanonicalizeUrl method is a utility function that canonicalizes a URL into a standard form to avoid duplicates. For example, "http://www.chilkatsoft.com/" and "http://www.chilkatsoft.com/default.asp" are the same URL.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
' The Chilkat Spider component/library is free.
set spider = Server.CreateObject("Chilkat.Spider")

' Does a DNS lookup to find the default domain, which may or may not include the "www." depending on the DNS results.
' Also domain names are converted to lowercase:
Response.Write spider.CanonicalizeUrl("http://www.ChilkatSoft.com/") & "<br>"

' CanonicalizeUrl will drop the HTML fragment:
Response.Write spider.CanonicalizeUrl("http://www.chilkatsoft.com/purchase2.asp#buyZip") & "<br>"

' If a username/password is in the URL, it gets dropped:
Response.Write spider.CanonicalizeUrl("http://username:password@www.chilkatsoft.com/purchase2.asp#buyZip") & "<br>"

' Port 80 and 443 are dropped:
Response.Write spider.CanonicalizeUrl("http://www.chilkatsoft.com:80/purchase2.asp") & "<br>"
Response.Write spider.CanonicalizeUrl("https://www.paypal.com:443/") & "<br>"

' Removes default pages:
' default.asp, index.html, index.htm, default.html, index.htm, default.htm
' index.php, index.asp, default.php, .cfm, .aspx, ,php3, .pl, .cgi, .txt, .shtml, .phtml
Response.Write spider.CanonicalizeUrl("http://www.chilkatsoft.com/index.asp") & "<br>"
Response.Write spider.CanonicalizeUrl("http://www.chilkatsoft.com/index.asp") & "<br>"
Response.Write spider.CanonicalizeUrl("http://www.chilkatsoft.com/index.php") & "<br>"
Response.Write spider.CanonicalizeUrl("http://www.chilkatsoft.com/index.pl") & "<br>"
Response.Write spider.CanonicalizeUrl("http://www.chilkatsoft.com/index.htm") & "<br>"

' Output:
' http://chilkatsoft.com/
' http://chilkatsoft.com/purchase2.asp
' http://chilkatsoft.com/purchase2.asp
' http://chilkatsoft.com/purchase2.asp
' https://www.paypal.com/
' http://chilkatsoft.com/
' http://chilkatsoft.com/
' http://chilkatsoft.com/
' http://chilkatsoft.com/
' http://chilkatsoft.com/

%>
</body>
</html>