tool / 09

HTTP Ping

Sample round-trip latency to any URL, from your own browser.

Target

fetch() timing, no-cors
$

Requests run in no-cors mode so this works against sites that don't send CORS headers — the tradeoff is that a resolved sample only proves something answered, not that it returned 200. A site that actively blocks cross-origin requests, or blocks mixed-content over plain HTTP, will show every sample as failed rather than slow.

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