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In nginx I can use set to define a variable, but is it possible to define a default?

e.g.

set $foo bar if $foo is not defined
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2  
What are you trying to accomplish? – Michael Hampton Nov 28 '12 at 17:20
up vote 3 down vote accepted
map $foo $new_foo {
    default  $foo;
    ''       bar;
}

or

if ($foo = '') {
    set $foo bar;
}
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