he reconnect delay.
 <p>
 In addition to handling the standard connection loss failures, JAX-RS <code>SseEventSource</code> behaves differently to various
 HTTP response status codes and headers:
 <ul>
 <li>200 - with <code><a href="../core/HttpHeaders.html#CONTENT_TYPE">"Content-Type"</a></code> header of "text/event-stream": This is normal
 operation. <code>onEvent</code> is invoked for each event.  <code>onComplete</code> is invoked when there are no more
 events. <code>onError</code> is invoked only if 