> If the server has nothing to send for a while, libcurl times out. The client then makes the request again. This results in a race condition if the server want

> If the server has nothing to send for a while, libcurl times out. The client then makes the request again. This results in a race condition if the server wants to send something between timeout and next request. Messages get lost. I think it's a premise of reliable long-polling that the server can hold on to messages across the changeover from one client request to the next.