feature: remove [scheme] from requests #1665

Job	Run time
build-test-cohttp-eio (ubuntu-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	2m 55s
build-test-cohttp-async (ubuntu-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !c...	3m 9s
build-test-cohttp-eio (macos-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	4m 5s
build-test-default (ubuntu-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-...	4m 3s
build-test-cohttp-async (ubuntu-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !coht...	7m 2s
build-test-cohttp-bench (ubuntu-latest, 5, *.opam )	6m 19s
build-test-default (ubuntu-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asy...	6m 5s
build-test-cohttp-async (macos-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	2m 14s
build-test-cohttp-async (macos-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !cohtt...	6m 30s
build-test-default (macos-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	2m 14s
build-test-default (macos-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asyn...	4m 27s
	49m 3s

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