title: How to set custom HTTP response headers in Next.js without using a custom server?
body: <p>I am working on a Next.js application, and I would like to add a custom HTTP response header to <em>all</em> pages (I don't need it to be configurable <em>per</em> page).</p>
  
  <p>Now I was wondering how to do that, <em>without</em> having to set up a custom server. Is this even possible? If so, how?</p>