Objective-C

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. Objective-C

#import <CkoSpider.h>

CkoSpider *spider = [[CkoSpider alloc] init];

//  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:
NSLog(@"%@",[spider CanonicalizeUrl: @"http://www.ChilkatSoft.com/"]);

//  CanonicalizeUrl will drop the HTML fragment:
NSLog(@"%@",[spider CanonicalizeUrl: @"http://www.chilkatsoft.com/purchase2.asp#buyZip"]);

//  If a username/password is in the URL, it gets dropped:
NSLog(@"%@",[spider CanonicalizeUrl: @"http://username:password@www.chilkatsoft.com/purchase2.asp#buyZip"]);

//  Port 80 and 443 are dropped:
NSLog(@"%@",[spider CanonicalizeUrl: @"http://www.chilkatsoft.com:80/purchase2.asp"]);
NSLog(@"%@",[spider 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
NSLog(@"%@",[spider CanonicalizeUrl: @"http://www.chilkatsoft.com/index.asp"]);
NSLog(@"%@",[spider CanonicalizeUrl: @"http://www.chilkatsoft.com/index.asp"]);
NSLog(@"%@",[spider CanonicalizeUrl: @"http://www.chilkatsoft.com/index.php"]);
NSLog(@"%@",[spider CanonicalizeUrl: @"http://www.chilkatsoft.com/index.pl"]);
NSLog(@"%@",[spider 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/