title: Add a header to each request using .htaccess
body: <p>I want to add a custom header to a phpbb installation without touching the code. (Using .htaccess)</p>
  
  <p>The header is: </p>
  
  <pre><code>Strict-Transport-Security: max-age=157680000
  </code></pre>
  
  <p>Any ideas?</p>