Check `isFile` for 404 before create stream #600

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Job	Run time
build (16, ubuntu-latest)	23s
build (16, windows-latest)	55s
build (16, macos-latest)	26s
build (18, ubuntu-latest)	22s
build (18, windows-latest)	57s
build (18, macos-latest)	32s
build (19, ubuntu-latest)	27s
build (19, windows-latest)	1m 5s
build (19, macos-latest)	44s
build (20, ubuntu-latest)	22s
build (20, windows-latest)	1m 2s
build (20, macos-latest)	57s
	8m 12s