Quote from the CSS configuration guide:
Reinserting an Arrowpoint Cookie in an HTTP Server Response
By default, the CSS always inserts an Arrowpoint (ARPT ) cookie in the first server response packet that begins with HTTP. More than likely during POST processing, the packet may contain a 100 Continue response instead of a 200 OK response. When the client receives the 100 Continue response with the inserted ARPT cookie, it may discard the response along with the cookie. Because the CSS does not reinsert the cookie when it receives a following 200 OK response, the client never uses the cookie and stickiness is broken.
To reinsert the Arrowpoint cookie in an HTTP server response if the previous packet contains a 100 Continue response, use the arpt-lct http-100-reinsertcommand. Use this command on a content rule configured with the advanced-balance arrowpoint-cookie command.
Is there an equivalent functionality on the ACE ?
I checked internally and I don't see any reference to the arpt-lct http-100-reinsert command and the ace. This probably indicates that no-one requiring this functionality has had issues on the ace. ie: either no-one has tried it or the ace works ok. I would suspect the former.
What is the scenario here ? Are you looking to migrate to ace and are on concerned or have you already migrated and its not working ?