try to reduce crawler accesses on cacheable data

1 files changed, 2 insertions, 1 deletions

diff --git a/itjs.class b/itjs.class
index 37cefe6..cf77f0c 100644
--- a/itjs.class
+++ b/itjs.class
@@ -186,7 +186,8 @@ static function far_future_headers($p = array())
 	if (it::is_live() && !$_REQUEST['retry'])
 	{
 		$keeptime = $crc == "-" ? 0 : ($crc || $p['nocrc'] ? 30*86400 : 900); # long expire if checksum present
-		header("Cache-Control: max-age=$keeptime, private"); # proxies should not cache since contents of same url can differ between browsers
+		$private = it::match('Googlebot|Bingbot|Slurp|DuckDuckBot', $_SERVER['HTTP_USER_AGENT']) ? "public" : "private";
+		header("Cache-Control: max-age=$keeptime, $private"); # proxies should not cache since contents of same url can differ between browsers
 		header("Expires: " . gmdate("D, d M Y H:i:s", time() + $keeptime). " GMT");
 	}
 }