$ curl -v -XPOST -d 'action=edit&format=json&formatversion=2&title=Probna&text=yey' localhost:8080/w/api.php
< HTTP/1.1 200 OK
< Date: Tue, 09 Jun 2015 10:43:03 GMT
* Server Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.9 is not blacklisted
< Server: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.9
< X-Powered-By: HHVM/3.6.1
< X-Content-Type-Options: nosniff
< Cache-control: private, must-revalidate, max-age=0
< MediaWiki-API-Error: notoken
< X-Frame-Options: DENY
< Transfer-Encoding: chunked
< Content-Type: application/json; charset=utf-8
< 
* Connection #0 to host localhost left intact
{"error":{"code":"notoken","info":"The token parameter must be set","docref":"See http://localhost:8080/w/api.php for API usage"}}