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Hwang Si Yeon authored
Add documentation of the URI format in the `--help` output of `redis-cli` and `redis-benchmark`. In particular, it's good for users to know that they need to specify "default" as the username when authenticating without a username. Other details of the URI format are described too, like scheme and dbnum. It used to be possible to connect to Redis using an URL with an empty username, like `redis-cli -u redis://:PASSWORD@localhost:6379/0`. This was broken in 6.2 (#8048), and there was a discussion about it #9186. Now, users need to specify "default" as the username and it's better to document it. Refer to #12746 for more details.
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