sS hInitWebSocket(O... _) {

  optPar S wsVar = "ws";

  optPar S onOpen;

  optPar S onMessage;

  optPar S readyMsg = "WebSocket ready!";

  ret hreconnectingWebSockets()

    + hscript([[

      var wsReady = false;

      var wsInitialMsgs = [];

      var wsVerbose = false;

      var ]] + wsVar + [[ = new ReconnectingWebSocket(((window.location.protocol === "https:") ? "wss://" : "ws://") + window.location.host + "/");

      ]] + wsVar + [[.onopen = function(event) {

        wsReady = true;

        console.log(]] + jsQuote(readyMsg) + [[);

        wsInitialMsgs.forEach(function(msg) {

          if (wsVerbose) console.log("Sending initial msg: " + msg);

          ws.send(msg);

        });

        ]] + jsDropTrailingComments(onOpen) + [[ };

      ]] + wsVar + [[.onmessage = function(event) {

        ]] + unnull(onMessage) + [[

      };

      // add an initial message to send when websocket opens

      // also send it now if ws is open already

      function wsInitialMsg(msg) {

        wsInitialMsgs.push(msg);

        if (wsReady) {

          if (wsVerbose) console.log("Sending initial msg: " + msg);

          ws.send(msg);

        }

      }

    ]]);

}