Mobile Web App With .htaccess File & Access-Control

I am currently hosting a mobile web app on a server running Linux/Apache. I added this .htaccess file:

Header add Access-Control-Allow-Origin "*"
Header add Access-Control-Allow-Headers "origin, x-requested-with, content-type"
Header add Access-Control-Allow-Methods "PUT, GET, POST, DELETE, OPTIONS"

But when I try to use any createHTTPClient either on the same server (in the same folder) or outside the server I get a connection error (0). Is there anything else I need to setup on my server to allow these httpRequests to operate correctly?