private HttpResponse createResponse(ContentRequest request) {
        Slime slime = new Slime();
        Cursor root = slime.setObject();
        root.setString("prepared", request.getUrlBase("/prepared"));
        return new SlimeJsonResponse(slime);
    }
Requests for content and content status, both for prepared and active sessions,
are handled by this class.

@author hmusum
configserver/src/main/java/com/yahoo/vespa/config/server/http/ContentHandler.java