I think this is an example of how creating a hash and obtaining a reference to it is just as easy as creating a reference to an anonymous hash, but the first example has a bug ({...} should be (...)).

This:

my %hash = {
    key1 => q{123},
    key2 => q{456},
};
my $h_ref1 = \%hash;
[download]

...should be:

my %hash = (
    key1 => q{123},
    key2 => q{456},
);
my $h_ref1 = \%hash;
[download]