[1]

Connection String URI Format — MongoDB Manual 2.6.7 (2015-01-24 08:01:19 +09:00 版) http://docs.mongodb.org/manual/reference/connection-string/

mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[database][?options]]

[2] Connection String URI Format — MongoDB Manual 3.2 (2016-10-28 23:53:37 +09:00) https://docs.mongodb.com/manual/reference/connection-string/