Shameless plug: I wrote about this issue with a lot of APIs some time ago. When a connection is broken unexpectedly, the protocol simply has no way to recover

Shameless plug: I wrote about this issue with a lot of APIs some time ago. When a connection is broken unexpectedly, the protocol simply has no way to recover the state of play and there's a risk of duplicate transactions popping up. http://blog.hackensplat.com/2014/07/is-your-api-broken.html http://blog.hackensplat.com/2014/07/is-your-api-broken.html