nntp: HDR allows metadata prefixed with ':'

RFC 3977, section 8.5.2 states metadata lookups can be done
with HDR.

1 files changed, 2 insertions, 3 deletions

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 6c661a1b..c2f97177 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -480,9 +480,8 @@ sub get_range ($$) {
 
 sub hdr_val ($$) {
         my ($r, $header) = @_;
-        $header = lc $header;
-        return $r->[3] if ($header eq 'bytes');
-        return $r->[4] if ($header eq 'lines');
+        return $r->[3] if $header =~ /\A:?bytes\z/i;
+        return $r->[4] if $header =~ /\A:?lines\z/i;
         $r = $r->[2]->header_obj->header($header);
         defined $r or return;
         $r =~ s/[\r\n\t]+/ /sg;