url_exists returns false for existing url

I use the function url_exists() to check whether a url exists (wow). For one set of urls, this doesn't work.

- For the same domain but different urls, the functions works correctly.
- When I download the xml file and save it locally, and run the function using the local url it works.

The headers I get back are as follows:

[0] => HTTP/1.1 200 OK
[1] => Date: Wed, 20 May 2009 15:26:22 GMT
[2] => Server: Apache/2.2.8 (Win32) mod_ssl/2.2.8 OpenSSL/0.9.8k
[3] => Last-Modified: Wed, 20 May 2009 15:21:54 GMT
[4] => ETag: "12d00000000006c-2635-46a59965b054e"
[5] => Accept-Ranges: bytes
[6] => Content-Length: 9781
[7] => Connection: close
[8] => Content-Type: application/xml

Any ideas what could cause this problem?

<?php
function url_exists($url) 
{
   $hdrs = get_headers($url);
    return is_array($hdrs) ? preg_match('/^HTTP\\/\\d+\\.\\d+\\s+2\\d\\d\\s+.*$/',$hdrs[0]) : false;
} 
?>

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