woothemes/woocommerce — pull request #5101 by justinstern (2014-03-11 04:06:06+00:00)
Title: Don't trailingslash Order Cancel URLs with a Query String

With non-pretty permalinks enabled, this was producing a URI like http://example.com/?page_id=7/ That final unnecessary trailing slash messes up some redirect gateways that are passed the cancel URL