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