The process of creating an authenticated Http client using the ClientLogin mechanism is to call the static function Zend_Gdata_ClientLogin::getHttpClient() and pass the Google account credentials in plain text. The return value of this function is an object of class Zend_Http_Client.

The optional third parameter is the name of the Google Data service. For instance, this can be 'cl' for Google Calendar. The default is "xapi", which is recognized by Google Data servers as a generic service name.

The optional fourth parameter is an instance of Zend_Http_Client. This allows you to set options in the client, such as proxy server settings. If you pass null for this parameter, a generic Zend_Http_Client object is created.

The optional fifth parameter is a short string that Google Data servers use to identify the client application for logging purposes. By default this is string "Zend-ZendFramework";

Below is an example of PHP code for a web application to acquire authentication to use the Google Calendar service and create a Zend_Gdata client object using that authenticated Http Client.

<?php
// Enter your Google account credentials
$email = 'johndoe@gmail.com';
$passwd = 'xxxxxxxx';
$client = Zend_Gdata_ClientLogin::getHttpClient($email, $passwd, 'cl');

$cal = new Zend_Gdata_Calendar($client);
?>

There is no method to revoke ClientLogin authentication as there is in the AuthSub token-based solution. The credentials used in the ClientLogin authentication are the login and password to a Google account, and therefore these can be used repeatedly in the future.