diff options
| -rw-r--r-- | lib/action.php | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/action.php b/lib/action.php index 455ebeff0..f19a047cf 100644 --- a/lib/action.php +++ b/lib/action.php @@ -812,11 +812,12 @@ class Action extends HTMLOutputter // lawsuit } if ($lm) { header('Last-Modified: ' . date(DATE_RFC1123, $lm)); - $if_modified_since = $_SERVER['HTTP_IF_MODIFIED_SINCE']; - if ($if_modified_since) { + if (array_key_exists('HTTP_IF_MODIFIED_SINCE', $_SERVER)) { + $if_modified_since = $_SERVER['HTTP_IF_MODIFIED_SINCE']; $ims = strtotime($if_modified_since); if ($lm <= $ims) { - $if_none_match = $_SERVER['HTTP_IF_NONE_MATCH']; + $if_none_match = (array_key_exists('HTTP_IF_NONE_MATCH', $_SERVER)) ? + $_SERVER['HTTP_IF_NONE_MATCH'] : null; if (!$if_none_match || !$etag || $this->_hasEtag($etag, $if_none_match)) { |