Navigate to Site administration -> Plugins -> Web services Enable web services Enable the XML-RPC protocol Choose " Select a service " Add a custom service called Foo Follow " Add functions " link and add the " core_webservice_get_site_info " function Navigate to {{Site administration -> Plugins -> Authentication -> Manage authentication Enable the Web service authentication plugin Open your console and ensure that you are in the directory of your site Edit your config.php to set the wwwroot to " http://localhost:8080 " Run the following your command line to run a local PHP server: php -S localhost:8080 Open a second console window and run: curl -v --url "http://localhost:8080/webservice/xmlrpc/simpleserver.php?wsusername=USERNAME&wspassword=USERPASSWORD" --data "<?xml version=\"1.0\" encoding=\"utf-8\"?><methodCall><methodName>core_webservice_get_site_info</methodName><params> <param> <value> <array> <data/> </array> </value> </param></params></methodCall>" Confirm you get a valid response in xml format Correct the username and password to any valid user and re-run Confirm you get a valid response in xml format