@Override
    protected void preHead(Page.HTML<__> html) {
        super.preHead(html);
        String jobID = $(APP_ID);
        set(TITLE, jobID.isEmpty() ? "Bad request: missing job ID" : join($(APP_TYPE) + " Application ", $(APP_ID)));
    }
Render a page that describes a specific job.
history-server/src/main/java/net/qihoo/hbox/jobhistory/HsJobPage.java