How does the Website Status Checker tell if a site is down or up?

The engine establishes an absolute connection handshake using custom browser identities over an HTTP GET routine. It safely interprets standard server headers, marking any HTTP response codes between 200 and 399�along side explicit exceptions like 403 Forbidden�as an active 'UP' operational state.

Why does a website show as down on the tool but load fine in my browser?

This discrepancy occurs when enterprise firewalls or edge security networks drop programmatic automated connections while permitting normal human browser interactions. Our engine uses advanced cURL techniques and custom headers to bypass false errors and match actual user behavior.