Websites using X-Clacks-Overhead
X-Clacks-Overhead is a non-standard HTTP header used to transmit tribute messages within server responses. Category: Miscellaneous. https://xclacksoverhead.org/home/about
91 sites in our index use X-Clacks-Overhead.
The most visited of them
| Site | Version | First seen |
|---|---|---|
| mozilla.org | 2026-10-28 12:21 | |
| duckdns.org | 2026-10-28 12:21 | |
| ubuntu.com | 2026-10-28 12:21 | |
| debian.org | 2026-10-28 12:22 | |
| mozilla.com | 2026-10-28 12:23 | |
| firefox.com | 2026-10-28 12:23 | |
| stackexchange.com | 2026-10-28 12:25 | |
| imgsrc.ru | 2026-10-28 12:29 | |
| mozilla.net | 2026-10-28 12:30 | |
| canonical.com | 2026-10-28 12:33 |
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