Do you still have this problem? Are you using www.php.net or php.net? Need feedback.

Using www.php.net

Same response:
{"success":false,"msg":"Unable to complete your request at this time. Please try again later..."}

If I continue to refresh without cache, I can occasionally get a success:
{"success":true,"update":-5}

However, it appears to not take effect as the vote tallies never change on subsequent refreshes.

Some of the mirrors don't allow external requests. There's nothing I can do about that part, but as for the tally not being reflected immediately after you cast the vote, this is expected behavior.

Once you cast the vote the request is made through javascript to our main php server and the database is updated then the new tally is returned through the API. That new tally is then provided immediately through javascript. However, if you were to refresh the page you will still see the old tallies because each php.net mirror keeps a local copy of the notes, which get updated periodically (usually once every hour or so).

So changes to the ratings may not be reflected in real time across all mirrors.

php.net exhibits broken behaviour as well.

An empty http response is generated, and the voting button turns to a red "X" with the tooltip text, "Error :("

That is quite possibly an Access-Control-Allow-Origin problem due to the client getting back a default 'http://' response header. Using one of the mirrors like us.php.net or ca.php.net typically doesn't result in this problem, but I've tried explicitly setting the headers. We'll see if that helps. http://php.net is an odd case because it accepts both php.net and www.php.net hosts in the request header.

Thank you for your bug report. This issue has already been fixed
in the latest released version of PHP, which you can download at 
http://www.php.net/downloads.php