title: whether an html link can opened in an http keep-alive connection?
body: <p>I'm working an netty + Http/websocket keep-alive server using Java 。
  in this new arthitect ,I need to resolve a problem : in my scenarios , clients can ping server successfully ,but server could not ping clients  .in previous arthitect ,there are many functions which server visit client directly ,such as server embedded html pages of clients in server page .
  so my question is whether server can still get/visit client's html pages directly  in a  netty + Http/websocket keep-alive connection ?
  do  I explain my question clearly ?  :(</p>