title: add headers to a response fired by ChannelHandlerContext (Netty)
body: <p>I have a jar, that I can't edit, that adds several headers to an http response. It then takes the response and<code>ctx.writeAndFlush(resp)</code></p>
  
  <p>Is there a way to catch this response elsewhere (like a middleware) and edit it (add/remove headers, etc)? </p>
  
  <p>The code uses Netty http tranport</p>