This is because WebView does not have zlib in a form consumable by WebKit, and thus builds WebKit without WTF_USE_ZLIB.
            
- relates to
- 
                    JDK-8098326 Implement WebSocket API without support for proxies -           
- Resolved
 
-         
- 
                    JDK-8097808 websockets not working in WebEngine -           
- Closed
 
-         
 P4
  P4