no use for double quotes here

apps/user_webfinger/host-meta.php

@@ -4,7 +4,7 @@ $hostMetaHeader = array(
 	'Content-Type' => 'application/xrd+json'
 );
 $serverName = $_SERVER['SERVER_NAME'];
-$hostMetaContents = "{\"links\":[{\"rel\":\"lrdd\",\"template\":\"http'.(isset($_SERVER['HTTPS'])?'s':'').'://'.$serverName.'/public.php?service=webfinger&q={uri}\"}]}";
+$hostMetaContents = '{"links":[{"rel":"lrdd","template":"http'.(isset($_SERVER['HTTPS'])?'s':'').'://'.$serverName.'/public.php?service=webfinger&q={uri}"}]}';
 foreach($hostMetaHeader as $header => $value) {
 	header($header . ": " . $value);
 }