Quote:
Originally Posted by corlock
users usually types an address without an http or www, that's why programmers uses redirection for redirecting to a complete URL address...
what you are saying is irrational, obviously, a site cannot be located or even published without an http://www or http://... 
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Most browsers assume http:// and if they can't find the domain they redirect it to a search engine query.
Of course, ftp:// and https:// are also among the valid protocols for a URL.