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SSEClient::wait_for_reconnect() sleeps in 100ms steps until the reconnect interval has elapsed. With an interval of 0 (for example "retry: 0" from the server, or set_reconnect_interval(0)) it never slept at all, so a server that sends "retry: 0" and closes the stream made the client reconnect in a tight loop. set_max_reconnect_attempts() does not stop this either, because each successful connection resets the attempt counter. Always wait at least one step (100ms). Intervals of 1-99ms already waited 100ms because of the step size, so only 0 and negative values change behavior.