SSE server reliability improvements

server/handlers/api/alerts.py

@@ -103,6 +103,7 @@ class APIAlertsStreamHandler(tornado_eventsource.handler.EventSourceHandler):
 
         except Exception as e:
             logging.warning("Exception when serving SSE socket", e)
+            self.close()
 
     def close(self):
         """When the user closes the socket, empty our queue and remove it from the list so the server no longer fills it"""