is a
 best-effort mechanism which does not provide any guaranty that all events would be delivered without a loss. You should
 therefore not rely on receiving every single event and design your client application code accordingly.
 <p>
 By default, when a connection to the SSE endpoint is lost, the event source will wait 500&nbsp;ms
 before attempting to reconnect to the SSE endpoint. The SSE endpoint can however control the client-side retry delay
 by including a special <code>retry</code> field value in a