drupal_http_request not returning data

Hi. This is odd and I've spent too much time trying to debug so thought I'd ask.

I've had a drupal_http_request on my site for some time now that suddenly has stopped returning data. A GET request in a browser does show XML being returned, but the drupal_http_request is showing empty data. I can't think of any reason why this has stopped working. Any help is appreciated. Thanks!

My code looks like this:

$rest_view = drupal_http_request('http://graham.umich.edu/rest/dow-masters-current-json');

Here is the output from krumo on that variable:

... (Object) stdClass

• request (String, 113 characters ) GET /rest/dow-masters-current-json HTTP/1.0 Us...
  GET /rest/dow-masters-current-json HTTP/1.0
  User-Agent: Drupal (+http://drupal.org/)
  Host: graham.umich.edu
  
  

• data (String, 0 characters )

• protocol (String, 8 characters ) HTTP/1.1

• status_message (String, 2 characters ) OK

• headers (Array, 11 elements)

• code (String, 3 characters ) 200