Pending rule event HTTP_REQUEST aborted

Hi, forgot to add my notes from troubleshooting the same log messages few months back. Myself and the customer managed simulate the behaviour, aborts were caused by http pause. When connection was reset, it caused browser to double send the data, in our case 2 items got added to shopping basket.

You might not be experiencing the same issue, but it's worth taking a look if web code contains any arguments that would pause the conversation while waiting for user/back end server input.