sub remove_content_headers { my $self = shift; unless (defined(wantarray)) { # fast branch that does not create return object delete @$self{grep $entity_header{$_} || /^content-/, keys %$self}; return; } my $c = ref($self)->new; for my $f (grep $entity_header{$_} || /^content-/, keys %$self) { $c->{$f} = delete $self->{$f}; } $c; }