Detect Yaws
Yaws (Yet Another Web Server) is an open-source web server designed to deliver dynamic content efficiently. It was developed by Claes (klacke) Wikström and is written in Erlang, a functional programming language.
Detection looks at response headers across 1 fingerprint rules among the site's public responses.
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Websites using Yaws
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Signal classes
PluginView evaluates public page signals in these classes when identifying Yaws. Individual fingerprint rule bodies are proprietary and are not published.
- Response headers
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Example public indicators for Yaws
Illustrative indicators derived from public catalog metadata for Yaws. A live scan may match additional proprietary rules beyond these examples.
- server: Yaws ?
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Yaws signature (1 rules) at the time of the scan.
- Does not establish
- A sitewide install of Yaws, an active vendor contract, exclusive use, or that Yaws is still in place today.
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How to check a site for Yaws
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest Yaws signals.
- 2. PluginView reads only public responses (response headers) and scores them against the Yaws signature set (1 rules).
- 3. Review the confidence score and text explanation for Yaws on the results page.
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FAQ: detecting Yaws
- Can PluginView detect Yaws without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for Yaws — typically response headers. It does not bypass authentication or paywalls.
- What category is Yaws?
- Yaws is classified under Web servers in the PluginView directory.
- How many fingerprint rules cover Yaws?
- This reference currently tracks 1 fingerprint rule across response headers. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses Yaws?
- Illustrative public indicators for Yaws include server: Yaws ?. A live scan may match additional proprietary rules beyond these examples.
