URL validators typically function by sending an HTTP request to the specified URL and analyzing the response. They check for several factors, including:
Status Codes: Validators verify that the URL responds with a 200 OK status, indicating that the page is accessible. Other status codes like 404 (Not Found) or 500 (Server Error) indicate issues. Redirects: Validators check if the URL is being redirected and whether the final destination is valid and secure. SSL Certificates: They confirm that the URL uses a secure connection (HTTPS), which is essential for protecting sensitive information. Content Analysis: Some advanced validators can analyze the content of the URL to ensure it matches the expected context and is not malicious.