code: @Deprecated
      public ApnsServiceBuilder withProxySocket(Socket proxySocket) {
          return this.withProxy(new Proxy(Proxy.Type.SOCKS,
                  proxySocket.getRemoteSocketAddress()));
      }
docs: Specify the socket to be used as underlying socket to connect
  to the APN service.
  
  This assumes that the socket connects to a SOCKS proxy.
  
  @deprecated use {@link ApnsServiceBuilder#withProxy(Proxy)} instead
  @param proxySocket   the underlying socket for connections
  @return  this