feature: remove [scheme] from requests #1668

Job	Run time
build-test-default (ubuntu-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-...	2m 38s
build-test-cohttp-async (ubuntu-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !c...	2m 28s
build-test-default (ubuntu-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asy...	5m 40s
build-test-cohttp-async (ubuntu-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !coht...	7m 3s
build-test-default (macos-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	2m 42s
build-test-cohttp-async (macos-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	2m 32s
build-test-default (macos-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asyn...	4m 22s
build-test-cohttp-async (macos-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !cohtt...	7m 50s
build-test-cohttp-eio (ubuntu-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	2m 58s
build-test-cohttp-bench (ubuntu-latest, 5, *.opam )	5m 51s
build-test-cohttp-eio (macos-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	4m 25s
	48m 29s

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