title: When is channelInactive called with keepalive on?
body: <p>I have a SimpleChannelInboundHandler which handles a few http requests:</p>
  
  <pre><code>CacheServerHandler extends SimpleChannelInboundHandler&lt;FullHttpRequest&gt;
  </code></pre>
  
  <p>When i do not explicitly close the channel/connection and keepalive is true, will channelInactive be called every time after channelRead0 is done?</p>
  
  <p>Or will channelInactive only be called once when the channel/connection is closed?</p>
  
  <p>I ask this because when keepalive is true on a http connection the connection isn't closed by client and client can send multiple requests without opening/closing the connection.</p>