Lua

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. Lua

local chilkat = require("chilkat")

local spider = chilkat.Spider.new()

-- 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:
print(spider:canonicalize_url("http://www.ChilkatSoft.com/"))

-- CanonicalizeUrl will drop the HTML fragment:
print(spider:canonicalize_url("http://www.chilkatsoft.com/purchase2.asp#buyZip"))

-- If a username/password is in the URL, it gets dropped:
print(spider:canonicalize_url("http://username:password@www.chilkatsoft.com/purchase2.asp#buyZip"))

-- Port 80 and 443 are dropped:
print(spider:canonicalize_url("http://www.chilkatsoft.com:80/purchase2.asp"))
print(spider:canonicalize_url("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
print(spider:canonicalize_url("http://www.chilkatsoft.com/index.asp"))
print(spider:canonicalize_url("http://www.chilkatsoft.com/index.asp"))
print(spider:canonicalize_url("http://www.chilkatsoft.com/index.php"))
print(spider:canonicalize_url("http://www.chilkatsoft.com/index.pl"))
print(spider:canonicalize_url("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/