Adding custom headers via next.config.js not working
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Ichneumonid wasp posted this in #help-forum
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Ichneumonid waspOP
Currently, I am trying to pass a header value containing the current pathname (like window.location.pathname) as a header to all my pages via next.config.js. However, when trying to see the header values in my layout file, the header value is undefined/null.
Here is my next.config.js file:
I am just trying to pass the current headers as a test value. In my layout.tsx file, I am grabbing the value through these lines, but it shows up as null.
Thank you again!
Here is my next.config.js file:
/** @type {import('next').NextConfig} */
const nextConfig = {
images: {...},
env: {...},
async headers() {
return [
{
source: '/:path*',
headers: [
{
key: 'X-Robots-Tag',
value: 'noindex'
}
]
}
]
}
};
module.exports = nextConfig
I am just trying to pass the current headers as a test value. In my layout.tsx file, I am grabbing the value through these lines, but it shows up as null.
const headersList = headers();
const pathname = headersList.get('X-Robots-Tag');
Thank you again!
6 Replies
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Ichneumonid waspOP
additionally, I am running
npm run turbo
/turbopack for my nextjs app![Avatar](https://cdn.discordapp.com/embed/avatars/2.png)
Ichneumonid waspOP
it seems like this might be a bug that vercel has in general. however, if anyone wants to take a stab at, you are more than welcome!
![Avatar](https://cdn.discordapp.com/avatars/484037068239142956/44415017de6fed2ccd5d44b4b2051ac0.webp?size=256)
joulev
1. the
2. you can do what you are trying to do by setting to the request headers instead using [middleware](https://nextjs.org/docs/app/building-your-application/routing/middleware#setting-headers), see the
3. even so, you cannot reliably get the pathname in the layout in server components because layouts don't rerender. see https://discord.com/channels/752553802359505017/752647196419031042/1147845307523158097 for an example of someone finding that out the (relatively) hard way. see [here](https://nextjs-discord-common-questions.joulev.dev/get-pathname-in-server-components) for a more detailed explanation
headers
here is the response header, set for the response from the server back to the browser, so the server components cannot access it- server gets request
- server components are rendered or taken from statically rendered store
- populate response <- headers are set here
- server returns response
2. you can do what you are trying to do by setting to the request headers instead using [middleware](https://nextjs.org/docs/app/building-your-application/routing/middleware#setting-headers), see the
x-hello-from-middleware1
example3. even so, you cannot reliably get the pathname in the layout in server components because layouts don't rerender. see https://discord.com/channels/752553802359505017/752647196419031042/1147845307523158097 for an example of someone finding that out the (relatively) hard way. see [here](https://nextjs-discord-common-questions.joulev.dev/get-pathname-in-server-components) for a more detailed explanation
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Ichneumonid waspOP
I tried doing it via 2 originally through middleware, but based on that issues thread for next.js/vercel, setting custom headers via middleware is broken for app router
![Avatar](https://cdn.discordapp.com/avatars/484037068239142956/44415017de6fed2ccd5d44b4b2051ac0.webp?size=256)
joulev
The issue above is about setting response header from server components, which is absolutely not related by any means to (2) which is setting request headers from middleware