title: System.Net.WebSockets Ping/Pong
body: <p>Does ClientWebSocket in System.Net.WebSockets automatically support ping/pong, meaning will my ClientWebSocket automatically respond with a pong if a ping is received from the server, or is this something I need to implement myself?</p>
  <p>Also where does the ClientWebSocket.Options.KeepAliveInterval come in? How does that differ from ping/pong.</p>