I’m trying to do a Session Authentication in an API.
The server is supposed to send a session_token as a cookie to the client.

This is what my code looks like:

            // If no session token found or session token is invalid/expired, generate a new one
            if (!$userId) {
                $session_token = $this->generateSessionToken();

                // Store the session token in the repository
                $this->storeSessionToken($user['ID_Utilisateur'], $session_token);

                $_SESSION['session_token'] = $session_token;

                // Set the session token as a cookie
                $cookie_success = setcookie('session_token', $session_token, time() + 86400, '/');
                if (!$cookie_success) {
                    echo("Failed to set session token cookie.");
                }

                // Store the session token in the PHP session
                $_SESSION['session_token'] = $session_token;
            }

Why testing the request on insomnia, the error “Failed to set session token cookie” and there is no cookies in the response header.

Why is it the case ?