$self->{gz} = PublicInbox::GzipFilter::gzip_or_die();
$fn = to_filename($fn // '') // 'no-subject';
# http://www.iana.org/assignments/media-types/application/gzip
bless $self, __PACKAGE__;
my $res_hdr = [ 'Content-Type' => 'application/gzip',
'Content-Disposition' => "inline; filename=$fn.mbox.gz" ];
$self->{gz} = PublicInbox::GzipFilter::gzip_or_die();
$fn = to_filename($fn // '') // 'no-subject';
# http://www.iana.org/assignments/media-types/application/gzip
bless $self, __PACKAGE__;
my $res_hdr = [ 'Content-Type' => 'application/gzip',
'Content-Disposition' => "inline; filename=$fn.mbox.gz" ];