#Get header in middleware

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copper wyvernBOT
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Hi @glad sigil. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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In Next.js, you can access request headers in middleware using the request.headers property of the NextRequest object. Here's an example of how you can do this:

import type { NextRequest } from 'next/server';

export function middleware(request: NextRequest) {
  // Access the 'x-powered-by' header
  const poweredByHeader = request.headers.get('x-powered-by');

  // Now you can use the 'poweredByHeader' variable
  console.log(poweredByHeader);
}

This code will log the value of the 'x-powered-by' header to the console. If the header is not present in the request, request.headers.get('x-powered-by') will return null.

Please note that by default, Next.js will add the x-powered-by header. If you want to opt-out of it, you can disable the poweredByHeader config in your next.config.js file:

module.exports = {
  poweredByHeader: false,
}

(Source: Next.js Docs (https://nextjs.org/docs/app/api-reference/next-config-js/poweredByHeader))

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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glad sigil
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@copper wyvern returns alway null

copper wyvernBOT
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Let me check the knowledge base for you. One moment! :books:

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If the x-powered-by header always returns null, it's likely that the header is not being set in the request, or it's being removed somewhere before your middleware function gets to it.

By default, Next.js does add the x-powered-by header, but it can be disabled in the next.config.js file. If you or someone else has added the following configuration, it would prevent the x-powered-by header from being added:

module.exports = {
  poweredByHeader: false,
}

(Source: Next.js Docs (https://nextjs.org/docs/app/api-reference/next-config-js/poweredByHeader))

If you're sure that the x-powered-by header should be present in the request and it's still returning null, you might want to check other parts of your application to make sure the header isn't being removed before your middleware function runs.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: