Q: Restfull web services and serialization module activated. After upgrade to Drupal 8.5, It receive always the error “A client error happened”. Now the response is always an “html format”: no json returns anymore. A: Simply used the same path and added ?_format=json at the end of the URL and it’s working. Example : http://site.com/view (page View) http://site.com/view?_format=json (custom […]