can't get past beforeFilter()

I've written a controller to handle a few XML-RPC requests, as well a
a basic PHP client to test with. The data is being passed to the
server ok but something's keeping the action from running. I've got
log statements in both beforeFilter and the action itself, but the
latter never show up in the log. Can anyone see anything I've missed?

function beforeFilter()
{
parent::beforeFilter();
$this->Auth->allowedActions = array('handle_request');
$this->layout = $this->autoRender = false;
Configure::write('debug', 0);
App::import('Vendor', 'kd_xmlrpc');

$this->log('beforeFilter');
$this->log($GLOBALS['HTTP_RAW_POST_DATA']);
$this->log($this->params);
}

function isAuthorized()
{
return true;
}

/**
* Handle a request
*
* @access public
* @param void
* @return void
*/
public function handle_request()
{
$this->log('handle_request');
$data = XMLRPC_parse($GLOBALS['HTTP_RAW_POST_DATA']);
$this->log($data);

$method_name = XMLRPC_getMethodName($data);

if (!method_exists(__CLASS__, $method_name))
{
$this->__error(
ERROR_XMLRPC_METHOD_NOT_FOUND,
"The method you requested, ${method_name}, was not found."
);
}

$params = XMLRPC_getParams($data);

$this->setAction($method_name, $params);
}

The log gets:

-- snip --
2011-03-26 23:37:05 Error: beforeFilter
2011-03-26 23:37:05 Error: <?xml version="1.0" ?>
<methodCall>
<methodName>memberExists</methodName>
<params>
<param>
<value>
<string>test@test.com</string>
</value>
</param>
</params>
</methodCall>

2011-03-26 23:37:05 Error: Array
(
[pass] => Array
(
)

[named] => Array
(
)

[plugin] =>
[controller] => member_rpcs
[action] => handle_request
[form] => Array
(
)

[url] => Array
(
[url] => members/rpc
)

)
-- snip --

That's it--nothing from the action itself. I also added, right after
App::import(...)

$this->log(XMLRPC_parse($GLOBALS['HTTP_RAW_POST_DATA']));

... and it looked fine. So there's no trouble with loading the vendor file.

I'm trying to figure out the best way to monitor what's happening
inside the controller. It seems to me that Auth shouldn't be
interfering, but I guess that's a possibility. But I'm not sure how to
check that, either.

This is the library I'm using, if anyone's interested:
http://keithdevens.com/software/xmlrpc

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