OAuth, PHP, Rest API and curl gives 400 Bad Request

Question

We got a couple of apps, utilizing the car2go Rest-API with OAuth 1.0.

All our web apps stopped working 2 days ago. All curl POST requests

Answer 1

Ok, this is what fixed this nightmare:

curl_setopt($ch,CURLOPT_HTTPHEADER ,array('Content-Length: 0'));

Aparrently it's not ok to send a curl POST without a header.