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It's About The Hashbangs
- program 15y agoTwitter does this: http://twitter.com/#!/twitter is parsed by the Google crawler as: http://twitter.com/?_escaped_fragment_=/twitter which is a 301 Moved Permanently to the old: http://twitter.com/twitter which in turn redirect to the #! version if you are logged. This is a mixed approach that mantain backward compatibility (and support Bing, Yahoo and other crawlers).