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Res HeadersSent

_includes/api/en/5x/res-headersSent.md

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<h3 id='res.headersSent'>res.headersSent</h3>

Boolean property that indicates if the app sent HTTP headers for the response.

js
app.get('/', (req, res) => {
  console.log(res.headersSent) // false
  res.send('OK')
  console.log(res.headersSent) // true
})