rspec/rules/S5689/javascript/rule.adoc

include::../description.adoc[]

include::../ask-yourself.adoc[]

include::../recommended.adoc[]

== Sensitive Code Example

https://www.npmjs.com/package/express[Express.js] name is disclosed by default into the ``x-powered-by``  HTTP header:

----
let express = require('express');
let app = express(); // Sensitive

app.get('/', function (req, res) {
  res.send('hello')
});
----

== Compliant Solution

``x-powered-by``  HTTP header should be disabled in https://www.npmjs.com/package/express[Express.js] with ``app.disable`` or with helmet https://www.npmjs.com/package/helmet[hidePoweredBy] middleware:

----
let express = require('express');

let app1 = express();  // Compliant
app1.disable("x-powered-by");

let helmet = require("helmet");
let app2 = express(); // Compliant
app2.use(helmet.hidePoweredBy());
----

include::../see.adoc[]