Expect-CT

The Expect-CT HTTP header tells browsers to expect Certificate Transparency. For more, see this blog post and the article on MDN.

Usage:

const expectCt = require('expect-ct')

// Sets Expect-CT: max-age=123
app.use(expectCt({ maxAge: 123 }))

// Sets Expect-CT: enforce, max-age=123
app.use(expectCt({
  enforce: true,
  maxAge: 123
}))

// Sets Expect-CT: enforce, max-age=30, report-uri="https://example.com/report"
app.use(expectCt({
  enforce: true,
  maxAge: 30,
  reportUri: 'https://example.com/report'
}))