Cross-Origin Resource Sharing (CORS)
This code performs a function called Cross-Origin Resource Sharing (CORS). Cross-Origin Resource Sharing (CORS) is a mechanism that allows many resources (e.g., fonts, JavaScript, etc.) on a web page to be requested from another domain outside the domain from which the first resource was served. $allowed_domains = ['https://qiksoft.com', 'https://aiplaygroundclub.com'];
if