const crypto/tls.extensionECHOuterExtensions

3 uses

	crypto/tls (current package)
		common.go#L130: 	extensionECHOuterExtensions      uint16 = 0xfd00
		ech.go#L319: 				if extension == extensionECHOuterExtensions {
		handshake_messages.go#L311: 		exts.AddUint16(extensionECHOuterExtensions)