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There's still a shebang in the URL. If I enter a URL without a shebang, it redirects to one that contains a shebang. Since the browser won't include the fragment in the request, how does the server know which page to send back without using JavaScript to make another request? So it's not really "server side", not even the initial page load.


If you read Twitter's actual announcement (http://engineering.twitter.com/2012/05/improving-performance...), they've only rolled out the described changes to the tweet permalink page. Other pages will see these changes over the coming weeks.


They can technically look at the referrer header value and look at the URL path of the referring page.




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