I have implemented the Codeigniter Rest Server as described in numerous tutorials.

I can make requests like http://localhost/folder/api/controller/postfunction and get a JSON response. 

The issue is when I host the files on a different server. 

Making a request like http://server_ip/api/controller/postfunction I get the response as status 0 with the message Empty reply from server.

After combing StackOverflow, I understand that the issue could be as a result of the request timing out or being cancelled before a response was received. 

But when I access http://server_ip/api/ I get 404 from Codeigniter. Which is okay. The issue arises when I access the controller file Controller.php i.e. http://server_ip/api/controller/

Any thoughts on how to go about resolving this? 

NB: the Controller.php has this line of code 

Could this be a source of the issue? 

Regards, 

Allan