[docs] Document the need for periodic writes on a streaming response [SPR-16494]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-16494 and commented

There is a regression in Reactor Netty 0.7.3, reported under issue 283, that was originally reported before 5.0 with #18523, but we never did add a test because it was fixed in Reactor Netty. The fix will again need to come from Reactor Netty but we should add an integration test on our side.

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Affects: 5.0.3

Issue Links:

• WebFlux SSE controller does not detect disconnected client [SPR-15306] #18523 WebFlux SSE controller does not detect disconnected client

Referenced from: commits 1908080, eb96ff2, 8c37ad7

[spring-projects-issues]

Rossen Stoyanchev commented

There is no immediate fix coming from the Reactor Netty side.

I'm turning this into a documentation task for now. For streaming to the response, applications need to consider emitting at regular intervals which would ensure detecting disconnected clients.