How to Resolve the \"Origin is Not Allowed by Access-Control-Allow-Origin\" Error in AJAX Requests?

Understanding the "Origin is Not Allowed by Access-Control-Allow-Origin" Error

When making AJAX requests from JavaScript, you may encounter the "Origin is not allowed by Access-Control-Allow-Origin" error. This error stems from the "same-origin policy," a security measure in JavaScript that restricts cross-origin requests.

Causes of the Error

The error occurs when attempting to make a request from your JavaScript code to a server with a different protocol (e.g., http:// vs. https://), host (e.g., example.com vs. subdomain.example.com), or port (e.g., port 80 vs. port 8080).

Resolution

To resolve this error, you have several options:

• Use JSONP: JSONP, a technique that leverages the