Properly set MIME-type

If the publishing protocol permits MIME-based identification of content types, the content typeof the metadata instance MUST be application/samlmetadata+xml.

www/saml2/idp/metadata.php

@@ -244,7 +244,7 @@ try {
         $t->data['metadataflat'] = htmlspecialchars($metaflat);
         $t->send();
     } else {
-        header('Content-Type: application/xml');
+        header('Content-Type: application/samlmetadata+xml');
 
         echo $metaxml;
         exit(0);