Download: PLP-3.25.tar.gz
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Makes a hash case insensitive, and sets some headers. <_> equals <->, so $foo{CONTENT_TYPE} is the same as $foo{'Content-Type'}.
$foo{CONTENT_TYPE}
$foo{'Content-Type'}
tie %somehash, 'PLP::Tie::Headers';
This module is part of the PLP internals and probably not of much use to others.