Detect X-Clacks-Overhead
X-Clacks-Overhead is a non-standard HTTP header used to transmit tribute messages within server responses.
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Websites using X-Clacks-Overhead
51 hostnames in the PluginView corpus for this technology.
| Hostname | Last seen |
|---|---|
| stackoverflow.com | 8/3/2026 |
| mozilla.org | 8/3/2026 |
| stackexchange.com | 8/3/2026 |
| serverfault.com | 8/3/2026 |
| superuser.com | 8/6/2026 |
Whole list · $5.10 (51 × $0.10)
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known X-Clacks-Overhead signature at the time of the scan.
- Does not establish
- A sitewide install of X-Clacks-Overhead, an active vendor contract, exclusive use, or that X-Clacks-Overhead is still in place today.
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How to check a site for X-Clacks-Overhead
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest X-Clacks-Overhead signals.
- 2. PluginView reads only public responses and scores them against proprietary X-Clacks-Overhead fingerprints. Rule bodies and identifiers are not published.
- 3. Review the confidence score and text explanation for X-Clacks-Overhead on the results page.
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FAQ: detecting X-Clacks-Overhead
- Can PluginView detect X-Clacks-Overhead without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for X-Clacks-Overhead. It does not bypass authentication or paywalls.
- What category is X-Clacks-Overhead?
- X-Clacks-Overhead is classified under Miscellaneous in the PluginView directory.
- Does PluginView publish X-Clacks-Overhead fingerprint rules?
- No. Detection uses proprietary fingerprint rules that are not published. Scan results explain matches in plain language without disclosing rule bodies or identifiers.
