Simplify nova-novncproxy related logic.

  *  Don't clobber default host/port

vnc_auto.html

@@ -90,9 +90,20 @@
             $D('sendCtrlAltDelButton').onclick = sendCtrlAltDel;
 
             document.title = unescape(WebUtil.getQueryVar('title', 'noVNC'));
+            host = WebUtil.getQueryVar('host', null);
+            port = WebUtil.getQueryVar('port', null);
+
+            // If a token variable is passed in, set the parameter in a cookie.
+            // This is used by nova-novncproxy.
             token = WebUtil.getQueryVar('token', null);
-            host = window.location.hostname;
-            port = window.location.port;
+            if (token) {
+                // If token is set, we are using nova-novncproxy.
+                // Use host and port of server that served this file.
+                host = window.location.hostname;
+                port = window.location.port;
+                WebUtil.createCookie('token', token, 1)
+            }
+
             password = WebUtil.getQueryVar('password', '');
             path = WebUtil.getQueryVar('path', 'websockify');
             if ((!host) || (!port)) {
@@ -110,12 +121,6 @@
                            'view_only':    WebUtil.getQueryVar('view_only', false),
                            'updateState':  updateState,
                            'onPasswordRequired':  passwordRequired});
-
-            /* If a token variable is passed in, set the parameter in a cookie.  This is
-               used by nova-novncproxy. */
-            if (token) {
-                WebUtil.createCookie('token', token, 1)
-            }
             rfb.connect(host, port, password, path);
         };
         </script>