headers

Source URL: https://nextjs.org/docs/app/api-reference/functions/headers

headers

headers is an async function that allows you to read the HTTP incoming request headers from a Server Component.

import { headers } from 'next/headers'

export default async function Page() {
  const headersList = await headers()
  const userAgent = headersList.get('user-agent')
}

import { headers } from 'next/headers'

export default async function Page() {
  const headersList = await headers()
  const userAgent = headersList.get('user-agent')
}

Reference

Parameters

headers does not take any parameters.

Returns

headers returns a read-only Web Headers object.

• Headers.entries(): Returns an iterator allowing to go through all key/value pairs contained in this object.
• Headers.forEach(): Executes a provided function once for each key/value pair in this Headers object.
• Headers.get(): Returns a String sequence of all the values of a header within a Headers object with a given name.
• Headers.has(): Returns a boolean stating whether a Headers object contains a certain header.
• Headers.keys(): Returns an iterator allowing you to go through all keys of the key/value pairs contained in this object.
• Headers.values(): Returns an iterator allowing you to go through all values of the key/value pairs contained in this object.

Good to know

• headers is an asynchronous function that returns a promise. You must use async/await or React’s use function.
  • In version 14 and earlier, headers was a synchronous function. To help with backwards compatibility, you can still access it synchronously in Next.js 15, but this behavior will be deprecated in the future.
• Since headers is read-only, you cannot set or delete the outgoing request headers.
• headers is a Dynamic API whose returned values cannot be known ahead of time. Using it in will opt a route into dynamic rendering.

Examples

Using the Authorization header

import { headers } from 'next/headers'

export default async function Page() {
  const authorization = (await headers()).get('authorization')
  const res = await fetch('...', {
    headers: { authorization }, // Forward the authorization header
  })
  const user = await res.json()

  return <h1>{user.name}</h1>
}

Version History

Version	Changes
v15.0.0-RC	headers is now an async function. A codemod is available.
v13.0.0	headers introduced.

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