iRule for supporting WebSocket in LTM v10.2.4

Hi,

We had developed an iRule for support WebSocket in LTM v10.2.4 HF7 (Although 11.4 had native support, but we had no plan to upgrade currently)

Sample handshake (http://en.wikipedia.org/wiki/WebSocketWebSocket_protocol_handshake)

when HTTP_RESPONSE {
   if status code is 101 (Switching Protocols) and there exists HTTP header "Upgrade: WebSocket",
   that means we are switching to WebSocket and thus HTTP filter shall be disabled
   use case insensitive matching
  if { [HTTP::status] == 101 && "websocket" eq [string tolower [HTTP::header value "Upgrade"]] } {
    HTTP::disable
  }
}

But it does not work. Adding debug message found that I never saw HTTP::status returns 101 (I had confirmed with tcpdump that the server did reply with status code 101). So I doubt that there are something wrong for handling this status code in LTM v10.2.4 HF7.

Currently I had used the following iRule which is less secure as it will disable HTTP filter once client request to switch to WebSocket without confirmation from server.

when HTTP_REQUEST {
   if client request contains a HTTP header "Upgrade: WebSocket", it indicate
   the client intended to switch to WebSocket, we shall disable HTTP filter here

   it is not very secure as we shall wait for response from server to confirm with
   status code 101 (Switching Protocols) with HTTP header "Upgrade: WebSocket"
   but it seems that LTM 10.2.4 HF7 have problem on that status code,
   so we have to workaround it.

   use case insensitive matching
  if { "websocket" eq [string tolower [HTTP::header value "Upgrade"]] } {
    HTTP::disable
  }
}

2 questions 1. Is there any problem in the support of status code 101 in LTM v10.2.4 HF7? 2. Any existing iRule for supporting WebSocket?