fix: get rid of flush (#1052) #1632

Job	Run time
build-test-cohttp-bench (ubuntu-latest, 5.x, *.opam )	7m 4s
build-test-cohttp-eio (ubuntu-latest, 5.x, http.opam cohttp.opam cohttp-eio.opam )	4m 18s
build-test-default (ubuntu-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-...	2m 55s
build-test-cohttp-eio (macos-latest, 5.x, http.opam cohttp.opam cohttp-eio.opam )	4m 34s
build-test-cohttp-async (ubuntu-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !c...	3m 15s
build-test-default (ubuntu-latest, 5.x, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	6m 52s
build-test-cohttp-async (ubuntu-latest, 5.x, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	7m 54s
build-test-default (macos-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	1m 54s
build-test-cohttp-async (macos-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	2m 13s
build-test-default (macos-latest, 5.x, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-as...	4m 57s
build-test-cohttp-async (macos-latest, 5.x, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !coh...	7m 40s
	53m 36s

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