Making Endpoint optional on transport options #504

Job	Run time
build (ubuntu-latest, Release)	3m 32s
build (ubuntu-latest, Debug)	2m 29s
build (windows-latest, Debug)	4m 32s
build (macos-latest, Release)	1m 35s
build (windows-latest, Release)	3m 39s
build (macos-latest, Debug)	2m 1s
publish-coverage	0s
	17m 48s

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