requireOK now uses the response body rather than the curl error to respond to errors

Author: dcarbone

src/AbstractApiClient.php

@@ -54,7 +54,7 @@ protected function requireOK(array $requestResult)
                 get_class($this),
                 $requestResult[1]->url,
                 $requestResult[1]->httpCode,
-                $requestResult[1]->curlError
+                $requestResult[1]->body
             ));
 
             Logger::error($err);