I'm not going to tell you what's wrong because I'll be accused of bashing another project. I'll let you read the logs and figure it out for yourself. Follow the trail of evidence and you'll discover the truth.

mod/hostxrd.php

@@ -3,6 +3,7 @@
 function hostxrd_init(&$a) {
 	header('Access-Control-Allow-Origin: *');
 	header("Content-type: text/xml");
+	logger('hostxrd',LOGGER_DEBUG);
 
 	$tpl = get_markup_template('xrd_host.tpl');
 	$x = replace_macros(get_markup_template('xrd_host.tpl'), array(

mod/wfinger.php

@@ -19,7 +19,7 @@ function wfinger_init(&$a) {
 	}
 
 	$resource = $_REQUEST['resource'];
-
+	logger('webfinger: ' . $resource,LOGGER_DEBUG);
 
 	$r = null;
 

mod/xrd.php

@@ -5,6 +5,7 @@ require_once('include/crypto.php');
 function xrd_init(&$a) {
 
 	$uri = urldecode(notags(trim($_GET['uri'])));
+	logger('xrd: ' . $uri,LOGGER_DEBUG);
 
 	if(substr($uri,0,4) === 'http')
 		$name = basename($uri);