<error code="An HTTP error occured: " info="fetchfileerror"/>

The error EVEN occures if I use the example from the api.php:

api.php?action=upload&filename=Wiki.png&url=http%3A//upload.wikimedia.org/wikipedia/en/b/bc/Wiki.png&ignorewarnings

Of course I appened the token and the format=xml at the end of the request and I'm using POST to submit.

The LocalSettings.php has the Values:

$wgEnableUploads = true;

$wgAllowCopyUploads = true;

I don't know whats the problem or if it's just don't works in that version. Has someone else that problem or has someone else succsessfully managed to upload a file through the API?

Note: I don't need it but the manuel file upload via Special:Upload page also don't works (the source filename field is empty after clicking on upload file but nothing else happens) maybe there is a relation between the problems?