title: Netty 4 : Configure client certificates in SslContextBuilder
body: <p>I have a p12 format client ssl certificates.</p>
  
  <p>How can I configure it in Netty in <a href="https://netty.io/4.1/api/io/netty/handler/ssl/SslContextBuilder.html" rel="nofollow">SslContextBuilder</a> class?</p>