An illustrative embodiment of a computer-implemented process for identifying a request invalidating a session excludes all marked logout requests of a Web application, crawls an identified next portion of the Web application and responsive to a determination, in one instance, that the state of the crawl is out of session, logs in to the Web application. The computer-implemented process further selects all crawl requests sent since a last time the crawl was in-session, excluding all marked logout requests and responsive to a determination that requests remain, crawls a selected next unprocessed request. Responsive to a determination, in the next instance, that state of the crawl is out of session and the selected request meets logout request criteria, the computer-implemented process marks the selected request as a logout request.