(Tcl) 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.

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load ./chilkat.dll

set spider [new_CkSpider]

# 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:
puts [CkSpider_canonicalizeUrl $spider http://www.ChilkatSoft.com/]

# CanonicalizeUrl will drop the HTML fragment:
puts [CkSpider_canonicalizeUrl $spider http://www.chilkatsoft.com/purchase2.asp#buyZip]

# If a username/password is in the URL, it gets dropped:
puts [CkSpider_canonicalizeUrl $spider http://username:password@www.chilkatsoft.com/purchase2.asp#buyZip]

# Port 80 and 443 are dropped:
puts [CkSpider_canonicalizeUrl $spider http://www.chilkatsoft.com:80/purchase2.asp]
puts [CkSpider_canonicalizeUrl $spider 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
puts [CkSpider_canonicalizeUrl $spider http://www.chilkatsoft.com/index.asp]
puts [CkSpider_canonicalizeUrl $spider http://www.chilkatsoft.com/index.asp]
puts [CkSpider_canonicalizeUrl $spider http://www.chilkatsoft.com/index.php]
puts [CkSpider_canonicalizeUrl $spider http://www.chilkatsoft.com/index.pl]
puts [CkSpider_canonicalizeUrl $spider 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

delete_CkSpider $spider