public static WebSocketWireProtocol guessWireProtocolVersion(HttpRequestMessage httpRequest) {
String httpRequestVersionHeader =
httpRequest.getHeader(WsHandshakeValidator.SEC_WEB_SOCKET_VERSION);
if (httpRequestVersionHeader == null || httpRequestVersionHeader.length() == 0) {
// Let's see if the request looks like Hixie 75 or 76
if (httpRequest.getHeader(WsHandshakeValidator.SEC_WEB_SOCKET_KEY1) != null
&& httpRequest.getHeader(WsHandshakeValidator.SEC_WEB_SOCKET_KEY2) != null) {
return WebSocketWireProtocol.HIXIE_76;
} else {
return WebSocketWireProtocol.HIXIE_75;
}
} else {
try {
return WebSocketWireProtocol.valueOf(Integer.parseInt(httpRequestVersionHeader));
} catch (NumberFormatException e) {
return null;
}
}
}
