silahq.com

Add a Content-Security-Policy header in next.config.js:

async headers() {
  return [{
    source: '/(.*)',
    headers: [
      { key: 'Content-Security-Policy', value: "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';" },
    ],
  }]
}

Add an X-Content-Type-Options header in next.config.js:

async headers() {
  return [{
    source: '/(.*)',
    headers: [
      { key: 'X-Content-Type-Options', value: 'nosniff' },
    ],
  }]
}

Add an X-Frame-Options header in next.config.js:

async headers() {
  return [{
    source: '/(.*)',
    headers: [
      { key: 'X-Frame-Options', value: 'DENY' },
    ],
  }]
}

Or use CSP's frame-ancestors directive for more flexibility.