2eb38810c5
... for individual tweets. To get a Tweet page with the old Twitter layout, an Internet Explorer User-Agent (e.g. Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko) as well as a Referer header pointing to the page itself is required. The "app_shell_visited" cookie appears to be optional at the moment, but that is what a regular web browser would send.