lift/framework — pull request #1309 by Shadowfiend (2012-08-18 20:03:47+00:00)
Title: AJAX request deduplication. Regular AJAX requests now carry a single-character version identifier. Server-side, if we've already seen a request for that identifier (meaning this is a retry), we make the request wait for the original processing code to fin

Continuations are used to wait for the completion of the initial request when
needed and available.