Server Sent Events Support on DigitalOcean LoadBalancers

I have an application API that works on Server-Sent Events (SSE,

It’s hosted in Managed kubernetes and exposed directly through Managed loadbalancer.

The Requests fail with “502 Bad Gateway”, “upstream connect error or disconnect/reset before headers. reset reason: protocol error”, although backend API shows 200 OK in logs.

As server-sent events are nothing but long-standing HTTP requests, there are ways to achieve it via increasing LoadBalancer <-> BackEnd SSE API HTTP connection timeout period.

I don’t see this option in DO LB though.

Ex. A workaround on GCP:

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Accepted Answer

Personally Solved by using Nginx Controller.

LoadBalance <- TCP -> Nginx Controller <- HTTP with timeout -> SSE API

kind: Ingress
    name: sse-api
    annotations: nginx "21600" "true"