Server Sent Events with spring-cloud-gateway

See original GitHub issue

I am using spring-cloud-gateway v2.0.0.M5 to proxy another spring boot application that uses Server Sent Events (SSE) to send some notifications to the GUI.

When I hit the notification server directly, it reaches GUI almost immediately after being published. However when I access notification server through spring-cloud-gateway, there is a lag between event publish and being received in the GUI. spring-cloud-gateway server seems to be batching the requests and flushes to the GUI in around a minute or so.

Is there a workaround to disable this behaviour. I don’t want a lag in the event publishing and delivery to the GUI. I suspect this is happening because transfer-encoding begin chunked in the response headers.

Access-Control-Allow-Credentials:true
Access-Control-Allow-Origin:http://localhost:63342
Content-Type:text/event-stream;charset=UTF-8
Date:Tue, 16 Jan 2018 01:57:52 GMT
transfer-encoding:chunked
transfer-encoding:chunked
Vary:Origin
X-Application-Context:notification-ms:dev:8030
X-Response-Default-Foo:Default-Bar

Issue Analytics

State:
Created 6 years ago
Comments:14 (7 by maintainers)

Top GitHub Comments

2reactions

spencergibbcommented, Feb 13, 2018

Turns out it had nothing to do with the header, but properly flushing the response for streaming media types.

1reaction

spencergibbcommented, Sep 30, 2019

Please learn how to properly format code and logs.

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