Make sure we don't write additional DATA frames when flushing once request is finished #20

Job	Run time
Soundness / Swift license headers check	6s
Integration Tests / Linux (5.9)	26s
Integration Tests / Windows (6.0)	1s
Integration Tests / Linux (5.10)	30s
Integration Tests / Linux (6.0)	5m 29s
Integration Tests / Windows (nightly-6.0)	1s
Integration Tests / Linux (nightly-6.0)	7m 4s
Integration Tests / Linux (nightly-main)	3m 15s
Soundness / API breakage check	3m 30s
Integration Tests / Windows (nightly-main)	1s
Soundness / Documentation check	2m 49s
Soundness / License headers check	4s
Soundness / Unacceptable language check	5s
Soundness / Format check	36s
Soundness / Broken symlinks check	10s
Soundness / Python lint check	5s
Soundness / YAML lint check	3s
Soundness / Shell check	34s
Cxx Interop / Cxx interop / Linux (5.9)	24s
Cxx Interop / Cxx interop / Windows (6.0)	3s
Cxx Interop / Cxx interop / Windows (nightly-6.0)	1s
Cxx Interop / Cxx interop / Linux (5.10)	25s
Cxx Interop / Cxx interop / Windows (nightly-main)	1s
Cxx Interop / Cxx interop / Linux (6.0)	2m 4s
Cxx Interop / Cxx interop / Linux (nightly-6.0)	2m 38s
Cxx Interop / Cxx interop / Linux (nightly-main)	2m 55s
Unit Tests / Unit tests / Linux (5.9)	28s
Unit Tests / Unit tests / Linux (5.10)	25s
Unit Tests / Unit tests / Windows (6.0)	3s
Unit Tests / Unit tests / Linux (6.0)	3m 4s
Unit Tests / Unit tests / Linux (nightly-6.0)	3m 50s
Unit Tests / Unit tests / Windows (nightly-6.0)	1s
Unit Tests / Unit tests / Windows (nightly-main)	1s
Unit Tests / Unit tests / Linux (nightly-main)	3m 25s
	44m 37s

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