Netty WriteTimeoutException with 1.0.0-beta-3

[Bluexin]

I just upgraded a WIP project of mine to Kotlin 1.3, and while doing this I upgraded Ktor from 0.9.5 to 1.0.0-beta-3.
Unfortunately, one of my pages (which worked just fine before), now doesn't load anything anymore (the client doesn't receive anything back from the server) and the server logs some of these :

Exception in thread "nettyWorkerPool-3-1" io.netty.handler.timeout.WriteTimeoutException
Exception in thread "nettyWorkerPool-3-2" io.netty.handler.timeout.WriteTimeoutException
Exception in thread "nettyWorkerPool-3-3" io.netty.handler.timeout.WriteTimeoutException
Exception in thread "nettyWorkerPool-3-4" io.netty.handler.timeout.WriteTimeoutException
Exception in thread "nettyWorkerPool-3-5" io.netty.handler.timeout.WriteTimeoutException
Exception in thread "nettyWorkerPool-3-1" io.netty.handler.timeout.WriteTimeoutException
Exception in thread "nettyWorkerPool-3-2" io.netty.handler.timeout.WriteTimeoutException
Exception in thread "nettyWorkerPool-3-3" io.netty.handler.timeout.WriteTimeoutException

(note that until I interrupt the browser trying to load the page these keep appearing at slow intervals, and that those don't get output to the logger, with no additional info)

It only happens for one of my pages and not the other one.

I will add more info (and try to make a simple test case for it) after a more thorough investigation of the issue, but was wondering if anyone was getting something similar.

[Bluexin]

Update on the investigation :

It may have something to do with the Compression feature.
However, that alone isn't enough to cause the issue (as even with Compression enabled some pages were loading fine and others weren't).
However, disabling it did prevent the issue from happening.

[cy6erGn0m]

There is a known bug around compression that causes it to close channel to early. It could cause timeouts but not completely sure yet.

[cy6erGn0m]

Workarounded in 1.0.0-beta-4