# Surrogate-Control controls our CDN, Cache-Control downstream caches
if ( $this->mConfig->get( 'UseESI' ) ) {
+ wfDeprecated( '$wgUseESI = true', '1.33' );
header( 'Surrogate-Control: max-age=' . $this->mCacheDuration . ', content="ESI/1.0"' );
header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
} else {
# this breaks strtotime().
$modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
$modsinceTime = strtotime( $modsince );
- $ismodsince = wfTimestamp( TS_MW, $modsinceTime ? $modsinceTime : 1 );
+ $ismodsince = wfTimestamp( TS_MW, $modsinceTime ?: 1 );
wfDebug( "$fname: -- client send If-Modified-Since: $modsince", 'private' );
wfDebug( "$fname: -- we might send Last-Modified : $lastmod", 'private' );