Empty API Responses

When calling the API, I occasionally receive empty responses. I get a 200 response code, content-length: 0 - just nothing.

I'm pulling JSON data for the following types - pages,operating-systems,cities,links-domains,traffic-sources

Not anything listed in the throttled list of types - and if I attempt a couple seconds later, I get data. It seems random and I can't find a pattern on my end.

This is the response I get (in PHP array format):

[date] => Tue, 04 Jun 2013 17:31:55 GMT
[server] => Apache
[content-location] => 4.php
[vary] => negotiate,Accept-Encoding
[tcn] => choice
[x-powered-by] => PHP/5.3.3-7+squeeze8
[cache-control] => no-cache, must-revalidate, post-check=0, pre-check=0
[expires] => Mon, 26 Jul 1997 05:00:00 GMT
[p3p] => CP='NOI DSP COR CUR OUR NID NOR'
[content-length] => 0
[connection] => close
[content-type] => text/javascript; charset=utf-8

Any guidance?

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i have the same problem