How to resolve the issue of ajax not setting the cookie properly?

If setting cookies through AJAX is not working, there may be a few reasons and solutions:

1. AJAX requests must be on the same domain in order to set cookies. If the domain of your AJAX request is different from the domain where cookies are being set, the browser will block the cookie setting. The solution is to make sure the domain of the AJAX request matches the domain where the cookies are being set.
2. For AJAX requests to allow cross-origin cookies, the withCredentials property must be set to true. By default, AJAX requests do not send cookies. Prior to sending an AJAX request, set xhr.withCredentials = true to enable the browser to send cookies. Additionally, the server must also set Access-Control-Allow-Credentials: true in the response headers to allow cross-origin requests to carry cookies.
3. If CORS (Cross-Origin Resource Sharing) is used, the corresponding cross-origin header information needs to be configured on the server side to allow cross-origin cookie settings. Add the following two fields to the server’s response header: Access-Control-Allow-Origin: * (allow all domain access) or Access-Control-Allow-Origin: your-domain.com (allow specified domain access) and Access-Control-Allow-Credentials: true (allow cross-origin requests to carry cookies).
4. If a cookie has the HTTPOnly flag, it cannot be accessed by client-side JavaScript. This is done for security reasons to prevent cross-site scripting attacks (XSS). If you need to access this cookie in an AJAX request, you can return the cookie’s value on the server side and pass it back in the AJAX response.

If the above methods still cannot solve the problem, it is recommended to check the error messages in the browser console to see if other errors are causing the cookie settings to be invalid.