Ensure SERVER_PROTOCOL exists

SimpleMachines · Jul 31, 2023 · 3c2c400 · 3c2c400
1 parent 84e74d0
commit 3c2c400
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Sources/Subs.php b/Sources/Subs.php
@@ -8170,7 +8170,7 @@ function send_http_status($code, $status = '')
 		503 => 'Service Unavailable',
 	);
 
-	$protocol = preg_match('~^\s*(HTTP/[12]\.\d)\s*$~i', $_SERVER['SERVER_PROTOCOL'], $matches) ? $matches[1] : 'HTTP/1.0';
+	$protocol = !empty($_SERVER['SERVER_PROTOCOL']) && preg_match('~^\s*(HTTP/[12]\.\d)\s*$~i', $_SERVER['SERVER_PROTOCOL'], $matches) ? $matches[1] : 'HTTP/1.0';
 
 	// Typically during these requests, we have cleaned the response (ob_*clean), ensure these headers exist.
 	require_once($sourcedir . '/Security.php');