I have an application API that works on Server-Sent Events (SSE, https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events).
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: https://stackoverflow.com/questions/44729212/running-a-https-sse-server-over-kubernetes-ingress-and-google-cloud-platform
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Personally Solved by using Nginx Controller.
LoadBalance <- TCP -> Nginx Controller <- HTTP with timeout -> SSE API