Guide to changing request headers in Next.js

Question

Guide to changing request headers in Next.js

I'm looking to include a custom header in each server request.

My current approach involves utilizing middleware in the following manner:

export async function middleware(req: NextRequest): Promise<NextResponse> {
    req.headers.append('x-custom-header', '1337');
    return NextResponse.next();
}

Upon checking with console.log(req.headers), I can confirm that the custom request header has been successfully added:

BaseHeaders [Headers] {
    [Symbol(map)]: {
      accept: [ '*/*' ],
      'accept-encoding': [ 'gzip, deflate, br' ],
      'accept-language': [ 'en-GB,en-US;q=0.9,en;q=0.8' ],
      'cache-control': [ 'no-cache' ],
      connection: [ 'keep-alive' ],
      cookie: ...,
      host: ...,
      pragma: [ 'no-cache' ],
      referer: ...,
      ...,
      'x-custom-header': [ '1337' ]
    }
  }

However, despite adding the custom header, it does not reflect on the browser's request itself.

What could be causing this issue? Are there other methods available for modifying request headers in Next.js?

javascript next.js

Answer 1

Answer №1

It appears that starting with the release of Next.js v13.0.0, there is now the capability to adjust request headers. You can find more information on this feature in the Next.js documentation.

Below is a snippet of code from the documentation demonstrating how to modify request headers:

// middleware.ts

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

export function middleware(request: NextRequest) {
  // Clone the request headers and set a new header `x-hello-from-middleware1`
  const requestHeaders = new Headers(request.headers)
  requestHeaders.set('x-hello-from-middleware1', 'hello')

  // You can also set request headers in NextResponse.rewrite
  const response = NextResponse.next({
    request: {
      // New request headers
      headers: requestHeaders,
    },
  })

  // Set a new response header `x-hello-from-middleware2`
  response.headers.set('x-hello-from-middleware2', 'hello')
  return response
}

Answer 2

It appears that starting with the release of Next.js v13.0.0, there is now the capability to adjust request headers. You can find more information on this feature in the Next.js documentation.

Below is a snippet of code from the documentation demonstrating how to modify request headers:

// middleware.ts

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

export function middleware(request: NextRequest) {
  // Clone the request headers and set a new header `x-hello-from-middleware1`
  const requestHeaders = new Headers(request.headers)
  requestHeaders.set('x-hello-from-middleware1', 'hello')

  // You can also set request headers in NextResponse.rewrite
  const response = NextResponse.next({
    request: {
      // New request headers
      headers: requestHeaders,
    },
  })

  // Set a new response header `x-hello-from-middleware2`
  response.headers.set('x-hello-from-middleware2', 'hello')
  return response
}

Answer 3

Answer №2

My solution involves middleware altering the header and reflecting the changes in getServerSideProps.

export async function modifyHeader(request: NextRequest) : Promise<NextResponse> {
    const response = NextResponse.next()
    response.headers.append("authorization", "token123")
    return response
}


//within the page component
export const getServerSideProps = wrapper.getServerSideProps(store => async (context) => {
    //checking the modified headers
    console.log(context.res.getHeaders())
    return {
      props: {}
    }
  }
});

Answer 4

My solution involves middleware altering the header and reflecting the changes in getServerSideProps.

export async function modifyHeader(request: NextRequest) : Promise<NextResponse> {
    const response = NextResponse.next()
    response.headers.append("authorization", "token123")
    return response
}


//within the page component
export const getServerSideProps = wrapper.getServerSideProps(store => async (context) => {
    //checking the modified headers
    console.log(context.res.getHeaders())
    return {
      props: {}
    }
  }
});

Answer 5

Answer №3

Interesting question that sparked my curiosity, as I have delved into SPA architectures extensively but haven't explored the specifics of nextjs and its SSR capabilities.

EXPLORING CUSTOM HEADERS AND CROSS SITE REQUEST FORGERY

One approach to tackle your query is to consider other scenarios where custom headers are useful and seek a solution in nextjs. A relevant aspect relates to security, such as using a custom request header like example-csrf to prevent Cross-Site Request Forgery (CSRF) in API requests that modify data.

In my search for techniques within nextjs, I came across the next-csrf library, which seems promising for addressing your issue. Although my understanding is limited, it appears that this library assists in generating the necessary request header values:

The middleware class functions upon receiving the request on the website to create the header value
This value is then passed to React components for execution within the browser:

import { getCsrfToken } from '../lib/csrf';

function MyApp({ Component, pageProps }) {
  return <Component {...pageProps} csrfToken={getCsrfToken()} />
}

Furthermore, you can transmit this value from the browser through React views if necessary:

const response = await fetch('/api/protected', {
    'headers': {
        'XSRF-TOKEN': csrfToken,
    }
});

It might be beneficial to peruse some issues or feedback on the CSRF GitHub repository to gain insights for shaping your own resolution.

REFLECTING ON THE ARCHITECTURE ASPECTS

This exploration is intriguing, considering nextjs' reputation for enhancing SEO and similar aspects. It brings to mind older web technologies where developers grappled with transitioning between client-side and server-side code. Maintaining control over data requests serves as a crucial technical base.

For reference, at Curity, we offer resources focusing on SPA security, CDN deployment, and developer experience. Though we don't currently utilize SSR, our future discussions may delve deeper into SSR applications:

Implementation of CSRF headers
Illustrative code example of the Token Handler pattern

Answer 6

Interesting question that sparked my curiosity, as I have delved into SPA architectures extensively but haven't explored the specifics of nextjs and its SSR capabilities.

EXPLORING CUSTOM HEADERS AND CROSS SITE REQUEST FORGERY

One approach to tackle your query is to consider other scenarios where custom headers are useful and seek a solution in nextjs. A relevant aspect relates to security, such as using a custom request header like example-csrf to prevent Cross-Site Request Forgery (CSRF) in API requests that modify data.

In my search for techniques within nextjs, I came across the next-csrf library, which seems promising for addressing your issue. Although my understanding is limited, it appears that this library assists in generating the necessary request header values:

The middleware class functions upon receiving the request on the website to create the header value
This value is then passed to React components for execution within the browser:

import { getCsrfToken } from '../lib/csrf';

function MyApp({ Component, pageProps }) {
  return <Component {...pageProps} csrfToken={getCsrfToken()} />
}

Furthermore, you can transmit this value from the browser through React views if necessary:

const response = await fetch('/api/protected', {
    'headers': {
        'XSRF-TOKEN': csrfToken,
    }
});

It might be beneficial to peruse some issues or feedback on the CSRF GitHub repository to gain insights for shaping your own resolution.

REFLECTING ON THE ARCHITECTURE ASPECTS

This exploration is intriguing, considering nextjs' reputation for enhancing SEO and similar aspects. It brings to mind older web technologies where developers grappled with transitioning between client-side and server-side code. Maintaining control over data requests serves as a crucial technical base.

For reference, at Curity, we offer resources focusing on SPA security, CDN deployment, and developer experience. Though we don't currently utilize SSR, our future discussions may delve deeper into SSR applications:

Implementation of CSRF headers
Illustrative code example of the Token Handler pattern

Answer 7

Answer №4

If you want to include custom headers in your application, you can do so similar to how you would add security headers. This can be achieved by utilizing the headers property within your next.config.js:

// next.config.js

// Define a list of security headers that you want to include
const customHeaders = []

module.exports = {
  async headers() {
    return [
      {
        // Add these specified headers to all routes within your app.
        source: '/:path*',
        headers: customHeaders,
      },
    ]
  },
}

Answer 8

If you want to include custom headers in your application, you can do so similar to how you would add security headers. This can be achieved by utilizing the headers property within your next.config.js:

// next.config.js

// Define a list of security headers that you want to include
const customHeaders = []

module.exports = {
  async headers() {
    return [
      {
        // Add these specified headers to all routes within your app.
        source: '/:path*',
        headers: customHeaders,
      },
    ]
  },
}

Guide to changing request headers in Next.js

Answer №1

Answer №2

Answer №3

Answer №4

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