This error occurs when a web page tries to make an AJAX request to a different domain than the one it originated from. The Cross-Origin Resource Sharing (CORS) policy is in place to prevent malicious scripts from accessing sensitive data across different domains.
In this case, the server that you are trying to access needs to include an “Access-Control-Allow-Origin” header in its response to allow your web page’s domain to access its resources. Without this header, the browser will block the request and return the error message you mentioned.
To fix this error, you need to either configure the server to include the necessary headers or use a proxy server that can handle cross-domain requests on behalf of your web page.
![5-01-15T13:58:44+08:00 [FATA][LIB][MonDB] server selection error: server selection timeout, current topology: { Type: Unknown, Servers: [{ Addr: 127.0.0.1:27017, Type: Unknown, Last error: connection() error occured during connection handshake: di...](https://linuxcpp.0voice.com/zb_users/upload/2023/05/202305162215397523846.png)
