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What is Canonicalization?

In information technology, canonicalization (pronounced KA-nahn-nihk-uhl-ih-ZAY-shun and sometimes spelled canonicalisation) is the process of making something canonicalcanonical -- that is, in conformance with some specification. To canonicalize (as well as the slightly less tortured variant canonify) is to ensure that data conforms to canonical rules, and is in an approved format. Canonicalization may sometimes mean generating canonical data from noncanonical data.

Canonicalization is the process by which various equivalent forms of a name can be resolved to a single standard name, or the "canonical" name. For example, on a specific computer, the names c:\dir\test.dat, test.dat, and ..\..\test.dat might all refer to the same file. Canonicalization is the process by which such names are mapped to a name that is similar to c:\dir\test.dat.

When a URL is received by a Web server, the server maps the request to a file system path that determines the response. The canonicalization routine that is used to map the request must correctly parse the URL to avoid serving or processing unexpected content. For more information about canonicalization, visit the following Microsoft Web site:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/THCMCh04.asp

How to programatically check for Canonicalization?

Visit this MSKB Article : 887459