Facebook old API Video upload

Our application uploads video to facebook (using the REST API video.upload method). Everything was working fine, but nearly 10 hours ago we started to receive the error "This method must run on api-video.facebook.com". We're already running it on api-video.facebook.com! The url is http://api-video.facebook.com/restserver.php?method=video.upload, it's hard开发者_高级运维coded in the application, and never changed. What's happening? How can this be fixed?

Since Facebook doesn't seem to want to document this:

• the call is to https://api-video.facebook.com/restserver.php
• params:
• access_token=...
• method=video.upload

The rest of the params work as before.