Index: includes/OutputPage.php
===================================================================
--- includes/OutputPage.php	(revision 59273)
+++ includes/OutputPage.php	(working copy)
@@ -1127,9 +1127,10 @@
 		if ( '' != $this->mRedirect ) {
 			# Standards require redirect URLs to be absolute
 			$this->mRedirect = wfExpandUrl( $this->mRedirect );
-			if( $this->mRedirectCode == '301') {
+			if(( $this->mRedirectCode == '301') || ($this->mRedirectCode == '303')) {
 				if( !$wgDebugRedirects ) {
-					$wgRequest->response()->header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
+					$statusMessage = array( '301' => 'Moved Permanently', '303' => 'See Other' );
+					$wgRequest->response()->header("HTTP/1.1 {$this->mRedirectCode} {$statusMessage[$this->mRedirectCode]}");
 				}
 				$this->mLastModified = wfTimestamp( TS_RFC2822 );
 			}