If you are using SES URLs or routes with FW/1 3.0 you should download FW/1 3.0.2 and update your applications as soon as possible, to address a thread safety issue in the way that
CGI.PATH_INFO was handled in FW/1 3.0. This is an update to 3.0.1 and includes a context root fix.
The symptoms you might see include incorrectly routed requests under load.
Thank you to David Sedeño who highlighted this critical issue!