I forget where this is documented (i'm not on my regular machine so I can't look it up), but in documentation
Foo->bar( [ $url [, $user [, $pass ]]])
usually means that
Foo->bar() takes none, or at most three arguments, as in
Foo->bar() or
Foo->bar($url) or
Foo->bar($url, $user) or
Foo->bar($url, $user, $pass).
[] means optional argument.
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