1 files changed, 2 insertions, 2 deletions
diff --git a/lib/PublicInbox/ExtMsg.pm b/lib/PublicInbox/ExtMsg.pm
index cf9b6d58..c6fc565a 100644
--- a/lib/PublicInbox/ExtMsg.pm
+++ b/lib/PublicInbox/ExtMsg.pm
@@ -137,9 +137,9 @@ again:
          if (@EXT_URL && index($mid, '@') >= 0) {
                  $code = 300;
                  $s .= "\nPerhaps try an external site:\n\n";
-                my $scheme = $cgi->scheme;
+                my $env = $cgi->{env};
                  foreach my $u (@EXT_URL) {
-                        $u = "$scheme:$u" if $u =~ m!\A//!;
+                        $u = PublicInbox::Hval::prurl($env, $u);
                          my $r = sprintf($u, $href);
                          my $t = sprintf($u, $html);
                          $s .= qq{<a\nhref="$r">$t</a>\n};