Xbase++

CanonicalizeUrl

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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. Xbase++

LOCAL oSpider

oSpider := 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:
? oSpider:CanonicalizeUrl("http://www.ChilkatSoft.com/")

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

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

//  Port 80 and 443 are dropped:
? oSpider:CanonicalizeUrl("http://www.chilkatsoft.com:80/purchase2.asp")
? oSpider: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
? oSpider:CanonicalizeUrl("http://www.chilkatsoft.com/index.asp")
? oSpider:CanonicalizeUrl("http://www.chilkatsoft.com/index.asp")
? oSpider:CanonicalizeUrl("http://www.chilkatsoft.com/index.php")
? oSpider:CanonicalizeUrl("http://www.chilkatsoft.com/index.pl")
? oSpider: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/

oSpider:destroy()