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How to Configure Custom Headers In Next.js?

7 minutes read

To configure custom headers in Next.js, you can use the getServerSideProps or getInitialProps function in your pages. You can include a headers key in the return value of these functions to set custom headers for the response. These headers can include things like authentication tokens, content type, or any other custom headers that your application requires. By setting custom headers in Next.js, you can enhance the security, performance, and functionality of your application.

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How to add security headers in Next.js?

To add security headers in Next.js, you can use the helmet middleware, which helps to secure your web applications by setting various HTTP headers. Here's how you can add security headers in your Next.js application:

  1. First, install the helmet package by running the following command in your terminal:
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npm install helmet


  1. Next, create a custom server file in the root of your Next.js project. You can name this file server.js or any other name you prefer.
  2. In the custom server file, import the necessary modules: 
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const express = require('express');
const next = require('next');
const helmet = require('helmet');


  1. Set up the Next.js server and add the helmet middleware to the express app:
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const dev = process.env.NODE_ENV !== 'production';
const app = next({ dev });
const handle = app.getRequestHandler();

app.prepare().then(() => {
  const server = express();

  // Add helmet middleware with required security headers
  server.use(helmet());

  server.get('*', (req, res) => {
    return handle(req, res);
  });

  server.listen(3000, (err) => {
    if (err) throw err;
    console.log('> Ready on http://localhost:3000');
  });
});


  1. Update your package.json file to use the custom server file by adding a "dev" script:
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"scripts": {
  "dev": "node server.js"
}


  1. Finally, start your Next.js application by running the following command in your terminal:
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npm run dev


Your Next.js application should now include security headers provided by the helmet middleware. You can customize the headers based on your specific security requirements by passing options to the helmet middleware function. For more information on customizing security headers using helmet, refer to the documentation: https://helmetjs.github.io/docs/.


How to configure response headers in Next.js?

To configure response headers in Next.js, you can use the setHeaders method in the next.config.js file. Here's an example of how to set custom response headers:

  1. Create a next.config.js file in the root of your Next.js project.
  2. Add the following code to the next.config.js file: 
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module.exports = {
  async headers() {
    return [
      {
        source: '/api/:path*', // Match all API routes
        headers: [
          // Set custom response headers for API routes
          { key: 'X-Content-Type-Options', value: 'nosniff' },
          { key: 'X-Frame-Options', value: 'DENY' },
          { key: 'Content-Security-Policy', value: 'default-src https:' },
        ],
      },
    ];
  },
};


In this example, we are setting custom response headers for all API routes. You can modify the source property to match specific routes or patterns.

  1. Save the next.config.js file.
  2. Restart your Next.js server to apply the changes.


Now, your Next.js application will send the specified response headers for the API routes you have configured. You can add more headers as needed by adding additional objects to the headers array.


How to configure custom user-agent headers in Next.js?

To configure custom user-agent headers in Next.js, you can utilize the getServerSideProps function to add custom headers to the request. Here is an example of how you can set custom user-agent headers in Next.js:

  1. Create a new page in your Next.js project or open an existing page.
  2. Use the getServerSideProps function to fetch data and add custom headers to the request. Here is an example: 
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export async function getServerSideProps(context) {
  const res = await fetch('https://api.example.com/data', {
    headers: {
      'User-Agent': 'Custom User Agent/1.0'
    }
  });
  
  const data = await res.json();

  return {
    props: {
      data
    }
  };
}

function MyPage({ data }) {
  // Render your data
}

export default MyPage;


In this example, we are fetching data from the https://api.example.com/data API endpoint and setting a custom user-agent header 'User-Agent': 'Custom User Agent/1.0' in the request.

  1. Run your Next.js application and navigate to the page where you added the custom user-agent headers. The request will now include the custom user-agent header.


By configuring custom user-agent headers in Next.js using the getServerSideProps function, you can customize the user-agent string for your requests and perform tasks such as browser detection or server-side rendering based on the user-agent.


How to configure custom headers for server-side rendering in Next.js?

To configure custom headers for server-side rendering in Next.js, you can use the getServerSideProps function in your page component.


Here's an example configuration:

  1. Create a page component in your pages directory, for example, pages/my-page.js.
  2. In the page component, define the getServerSideProps function and set the headers property in the options object. Here's an example: 
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const MyPage = ({ data }) => {
  return (
    <div>
      <h1>{data}</h1>
    </div>
  );
};

export async function getServerSideProps(context) {
  const res = await fetch('https://api.example.com/data', {
    headers: {
      Authorization: 'Bearer YOUR_ACCESS_TOKEN',
      'Content-Type': 'application/json',
    },
  });

  const data = await res.json();

  return {
    props: {
      data,
    },
  };
}

export default MyPage;


In this example, we are fetching data from an API with custom headers. We set the Authorization header with a bearer token and the Content-Type header to application/json.

  1. When the page is rendered server-side, it will make the API request with the custom headers and pass the data to the page component.
  2. Access the data in your page component and render it as needed.


By using the getServerSideProps function with custom headers, you can configure server-side rendering in Next.js to fetch data from APIs with specific authorization and content-type headers.

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