rspec/rules/S5736/javascript/rule.adoc

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== Sensitive Code Example

In Express.js application the code is sensitive if the https://www.npmjs.com/package/helmet[helmet] ``++referrerPolicy++`` middleware is disabled or used with ``++no-referrer-when-downgrade++`` or ``++unsafe-url++``:

----
const express = require('express');
const helmet = require('helmet');

app.use(
  helmet.referrerPolicy({ 
    policy: 'no-referrer-when-downgrade' // Sensitive: no-referrer-when-downgrade is used
  })
);
----

== Compliant Solution

In Express.js application a secure solution is to user the https://www.npmjs.com/package/helmet[helmet] referrer policy middleware set to ``++no-referrer++``:

----
const express = require('express');
const helmet = require('helmet');

let app = express();

app.use(
  helmet.referrerPolicy({
    policy: 'no-referrer' // Compliant
  })
); 
----

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== Implementation Specification
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