Pending rule event HTTP_REQUEST aborted

Apologies, it's halt/pause/sleep/wait option form within html and not http. The request to halt connection before continuing can come from any of the scripts used by site. In my case; we replicated issue by creating html file with php "sleep()" switch before resuming communication to load further content. This was performed by customer, I am not a web developer and don't know enough to give you exact details. The information was provided by customer while troubleshooting.

As for RST; please do bear in mind that a stateful device forges a RST packet to clear state table for inactive session. Further more, capture performed on the F5, client or server? Can you also see RST on the server? Can you see RST on the client?