parser fix

libs/MultipartFormDataParser.php

@@ -13,7 +13,10 @@ class MultipartFormDataParser
             throw new \RuntimeException('Invalid multipart Content-Type');
         }
 
-        $boundary = $m[1] !== '' ? $m[1] : $m[2];
+        $boundary = (isset($m[1]) && $m[1] !== '') ? $m[1] : ($m[2] ?? '');
+        if ($boundary === '') {
+            throw new \RuntimeException('Missing multipart boundary');
+        }
         $rawBody = (string)$request->getBody();
         if ($rawBody === '') {
             $rawBody = (string)file_get_contents('php://input');
@@ -33,7 +36,7 @@ class MultipartFormDataParser
                 continue;
             }
 
-            $split = preg_split("/\r\n\r\n/", $part, 2);
+            $split = preg_split("/\r?\n\r?\n/", $part, 2);
             if (!$split || count($split) !== 2) {
                 continue;
             }
@@ -72,7 +75,7 @@ class MultipartFormDataParser
     private static function parseHeaders(string $rawHeaders): array
     {
         $headers = [];
-        foreach (preg_split('/\r\n/', $rawHeaders) as $line) {
+        foreach (preg_split('/\r?\n/', $rawHeaders) as $line) {
             $line = trim($line);
             if ($line === '' || strpos($line, ':') === false) {
                 continue;