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Point any of these at a live URL for an instant read: is it up, how fast does it respond, is the SSL certificate about to expire, and what do its response headers actually say about caching, CORS, and security.
Get server response time and an estimated TTFB for any website.
See if any API, site, or service is down.
Check status, response time, and payload size for any public API endpoint.
See when a domain's TLS certificate expires.
See what every response header does to caching, CORS and security.