title: What response should If-Modified-Since HTTP Header return if request is HEAD?
body: <p>If you send a GET request with an If-Modified-Since header, the server suports it and the file hasn't changed, the server will return a 304 response.</p>
  
  <p>If you sent a HEAD request in the same circumstances, should the server send a 304 response or send back the full headers you would have sent had the file changed?</p>
  
  <p>In short: is GET / HEAD equivalent when requesting a file that has not changed?</p>