function handleRequest(request, response)

{

  if (request.queryString == "")

  {

    var etag = request.hasHeader("If-Match") ? request.getHeader("If-Match") : null;

    if (!etag || etag == getState("etag"))

    {

      response.setStatusLine(request.httpVersion, 200, "Ok");

      response.setHeader("Content-Type", "text/html");

      response.setHeader("ETag", getState("etag"));

      response.setHeader("Cache-control", "max-age=36000");

      response.write(getState("etag"));

    }

    else if (etag)

    {

      response.setStatusLine(request.httpVersion, 412, "Precondition Failed");        

    }

  }

  else

  {

    var etag = request.queryString.match(/^etag=(.*)$/);

    if (etag)

      setState("etag", etag[1]);

    response.setStatusLine(request.httpVersion, 204, "No content");

  }

}