SSE custom headers #3

server/handlers/api/alerts.py

@@ -53,6 +53,11 @@ class APIAlertsStreamHandler(tornado_eventsource.handler.EventSourceHandler):
         self.sse_alert_queues = sse_alert_queues
         self.web_server_metrics = web_server_metrics
 
+    # Custom headers to avoid e.g. nginx reverse proxy from buffering SSE data
+    def custom_headers(self):
+        return {"Cache-Control": "no-store",
+                "X-Accel-Buffering": "no"}
+
     def open(self):
         try:
             # Metrics