Umlaut has a few custom URL parameters (can also be sent in a POST request) to control Umlaut behavior. All start with the prefix "umlaut.". These are generally added onto an OpenURL GET request.
===umlaut.force_https_link===
When present and set to any value, causes all absolute urls to be generated with https, even if the Umlaut app doesn't think it was accessed over https. Useful for certain kinds of reverse proxy deployment where it really is being accessed https, but the Rails app doesn't know it.
===umlaut.request_id===
