Checks up to five public URLs now from this Worker: up or down, HTTP status, the final URL after up to five redirects, response time in milliseconds, whether TLS was used, content type and length, and the Cloudflare data centre (colo) the check ran from. A down site is a valid 200 answer with up false and the error, not a failure. The check is one GET per hop, so it measures the first response, not the full page.

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