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I am wondering why the link to profile looks like:
http://stackoverflow.com/users/ID/NAME not simply:
http://stackoverflow.com/users/ID or even better:
http://stackoverflow.com/users/NAME Can there be couple users with the same name? Or can one user have many names?
All SO-URLs are of the form id/description where the ID is unique and the description is optional. So
/users/12890/arne-burmeisteris the same as/users/12890/huhuand/questions/420380/why-does-the-link-to-the-user-profile-have-both-id-and-nameis the same as/questions/420380/foo. The retrieval just uses the ID, but it is much better for google ranking, when the user/question/what-ever-should-be-found occurs in the URL (also for humans this is much more descriptive ;-).By the way, retrieval by ID is faster than by such a large text string. And of course, the URL remains valid if someone changes their user name or the question.