Error when parsing XML with PHP

Warning: simplexml_load_file(): http://goo.gl/GZXZqb:2: parser error : Extra content at the end of the document in /home/XXX on line 138

Warning: simplexml_load_file(): Notice: Undefined index: HTTP_USER_AGENT in /home/vhosts/XXX/web/c in /home/XXX on line 138

Warning: simplexml_load_file(): ^ in /home/mXXX on line 138

*** If i save the file on my server it is work (save as xxx.xml) php code:

$xml = simplexml_load_file('http://goo.gl/GZXZqb','SimpleXMLElement',LIBXML_NOCDATA);