const github.com/refraction-networking/utls.utlsExtensionECHOuterExtensions

one use

	github.com/refraction-networking/utls (current package)
		u_common.go#L43: 	utlsExtensionECHOuterExtensions     uint16 = 0xfd00 // draft-ietf-tls-esni-17

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