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-rw-r--r--lib/PublicInbox/RepoGitDiff.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/RepoGitDiff.pm b/lib/PublicInbox/RepoGitDiff.pm
index 0e79f119..26728402 100644
--- a/lib/PublicInbox/RepoGitDiff.pm
+++ b/lib/PublicInbox/RepoGitDiff.pm
@@ -54,7 +54,7 @@ sub call_git_diff {
         $qsp->psgi_return($env, undef, sub { # parse header
                 my ($r) = @_;
                 if (!defined $r) {
-                        [ 500, [ 'Content-Type', 'text/html' ], [ $git->err ]];
+                        [ 500, [ 'Content-Type', 'text/plain' ], [ $git->err ]];
                 } elsif ($r == 0) {
                         [ 200, [ 'Content-Type', 'text/html' ], [
                                 delete($req->{dhtml}).