Set the session of subdomain using ajax

Question

I'm using a domain like www.example.com and a sub-domain like sub.example.com.

I'm trying to call the Login function of sub.example.com. In the end I cant set the session of sub.example.com for future functions to be called.

I'm using CodeIgniter in my sub-domain and my root domain just has an HTML page with native JavaScript. I wanted to use sub.example.com as my endpoint for all my sub-websites.

I tried changing the config of my subdomain(CI) to

$config['cookie_prefix']    = "";
$config['cookie_domain']    = ".example.com";
$config['cookie_path']      = "/";
$config['cookie_secure']    = FALSE;

and also the index.php file of my www.example.com to:

session_set_cookie_params(0, '/', '.example.com');
session_start();

Answer 1

I solved my problem by setting header("Access-Control-Allow-Credentials: true");[SERVER-SIDE] and $http.defaults.withCredentials = true;[CLIENT-SIDE] using Angular $httpProvider upon request

And also don't forget to set the header("Access-Control-Allow-Origin: www.example.com");[SERVER-SIDE] my root domain to have an access to my sub-domain.

but if you have multiple domains/sub-domains to allow you can use below code

$http_origin = $_SERVER['HTTP_ORIGIN'];

if ($http_origin == "http://www.domain1.com" || $http_origin == "http://www.domain2.com" || $http_origin == "http://www.domain3.info")
{  
    header("Access-Control-Allow-Origin: $http_origin");
}

for more info Access-control-allow-credentials