Using Sitecore 8.1 rev 160519, WFFM 8.1 rev 160523
I've created a custom WffmSaveAction, and inside it I use HttpContext.Current to access cookies and the current page path. This all works fine on my single server dev environment. However in the live environment, with separate CD / CM servers, HttpContext.Current is null inside my save action Execute.
I assume I have some kind of server configuration problem but I don't know why it would be behaving differently. Any ideas? Thanks.