githttpbackend: match Content-Type of git-http-backend(1)

This will allow cache proxies such as Varnish to avoid
caching data sent by us.

1 files changed, 18 insertions, 4 deletions

diff --git a/lib/PublicInbox/GitHTTPBackend.pm b/lib/PublicInbox/GitHTTPBackend.pm
index b4851920..a9c0e9c7 100644
--- a/lib/PublicInbox/GitHTTPBackend.pm
+++ b/lib/PublicInbox/GitHTTPBackend.pm
@@ -64,15 +64,29 @@ sub drop_client ($) {
         }
 }
 
+my $prev = 0;
+my $exp;
+sub cache_one_year {
+        my ($h) = @_;
+        my $t = time + 31536000;
+        push @$h, 'Expires', $t == $prev ? $exp : ($exp = time2str($prev = $t)),
+                'Cache-Control', 'public, max-age=31536000';
+}
+
 sub serve_dumb {
         my ($env, $git, $path) = @_;
 
         my @h;
         my $type;
-        if ($path =~ /\A(?:$BIN)\z/o) {
-                $type = 'application/octet-stream';
-                push @h, 'Expires', time2str(time + 31536000);
-                push @h, 'Cache-Control', 'public, max-age=31536000';
+        if ($path =~ m!\Aobjects/[a-f0-9]{2}/[a-f0-9]{38}\z!) {
+                $type = 'application/x-git-loose-object';
+                cache_one_year(\@h);
+        } elsif ($path =~ m!\Aobjects/pack/pack-[a-f0-9]{40}\.pack\z!) {
+                $type = 'application/x-git-packed-objects';
+                cache_one_year(\@h);
+        } elsif ($path =~ m!\Aobjects/pack/pack-[a-f0-9]{40}\.idx\z!) {
+                $type = 'application/x-git-packed-objects-toc';
+                cache_one_year(\@h);
         } elsif ($path =~ /\A(?:$TEXT)\z/o) {
                 $type = 'text/plain';
                 push @h, @no_cache;