GraalVM smoke tests

Simplify `HttpTrafficHandler#write` #286

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Run time

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Job	Run time
build (ubuntu-20.04, native)	3m 29s
build (ubuntu-20.04, nio)	3m 35s
build (macos-12, native)	4m 3s
build (macos-12, nio)	3m 48s
build (windows-2022, nio)	4m 3s
	18m 58s