fix promise not being awaited

lib/AuthHandler.ts

@@ -280,7 +280,7 @@ export default function create_auth_handler (
     const token = (/(?<type>\S+) (?<token>.+)/ui)
       .exec (req.headers.authorization as string);
 
-    process_request (request, token, default_handler, options);
+    await process_request (request, token, default_handler, options);
 
     return request.is_successful;
   };