(Visual FoxPro) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loSpider

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Spider')
loSpider = 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:
? loSpider.CanonicalizeUrl("http://www.ChilkatSoft.com/")

* CanonicalizeUrl will drop the HTML fragment:
? loSpider.CanonicalizeUrl("http://www.chilkatsoft.com/purchase2.asp#buyZip")

* If a username/password is in the URL, it gets dropped:
? loSpider.CanonicalizeUrl("http://username:password@www.chilkatsoft.com/purchase2.asp#buyZip")

* Port 80 and 443 are dropped:
? loSpider.CanonicalizeUrl("http://www.chilkatsoft.com:80/purchase2.asp")
? loSpider.CanonicalizeUrl("https://www.paypal.com:443/")

* 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
? loSpider.CanonicalizeUrl("http://www.chilkatsoft.com/index.asp")
? loSpider.CanonicalizeUrl("http://www.chilkatsoft.com/index.asp")
? loSpider.CanonicalizeUrl("http://www.chilkatsoft.com/index.php")
? loSpider.CanonicalizeUrl("http://www.chilkatsoft.com/index.pl")
? loSpider.CanonicalizeUrl("http://www.chilkatsoft.com/index.htm")

* 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

RELEASE loSpider