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$ctx->cat(\*FILE, 'http://127.0.0.1/file.txt', 'HEAD');

open FILE, '>', 'file.txt.HEAD' or die $!;

open my $FH, '>', 'file.txt.HEAD' or die $!;
$ctx->cat($FH, 'http://127.0.0.1/file.txt', 'HEAD');