To allow a browser on another site to make an Ajax request to your server, you need to enable Cross-Origin Resource Sharing (CORS). This is a security feature implemented by browsers to prevent scripts running on one origin from accessing resources from a different origin.
To enable CORS, you need to modify the server-side code to include the appropriate CORS headers in the response. These headers specify which origins are allowed to make requests, which HTTP methods are supported, and other parameters.
For example, if you are using PHP, you can enable CORS by adding the following code to the top of your PHP script:
header('Access-Control-Allow-Origin: *');header('Access-Control-Allow-Methods: GET, POST, OPTIONS');header('Access-Control-Allow-Headers: Content-Type');
The first header specifies which origins are allowed to access the resource, in this case, the `*` wildcard allows any origin to make requests. The second header specifies which HTTP methods are allowed, and the third header specifies which headers are allowed in the request.
Note that enabling CORS can be a security risk, as it allows any website to access your server resources. You should therefore carefully consider which origins to allow and which HTTP methods and headers to support.