在Ajax操作之后，ASP.NET的响应类型中的文本含义

Question

Ajax操作后的HTTP响应示例：

1|#||4|5728|updatePanel|ctl00_ContentPlaceHolder1_updatePanel1|
                <div id="ctl00_ContentPlaceHolder1_ctl01_98e2461c-a8c0-4a65-9d98-2ee4b8c0b1cd" class="multiple-choice-check-box-horiz clearfix fieldset">
<div class="question-box">
    <div class="question-area">
        <div class="question-container">
            <div class="question">
                <span class="question-text">Choice - Multiple Answers (Horizontal) No question test</span>
            </div><div class="choices clearfix">
                <ul id='chkMC' class='multiselect-checkboxes horizontal left clearfix'><li><span class="radio-btn"><input id="ctl00_ContentPlaceHolder1_ctl01_CheckboxChoices0-842352753" type="checkbox" name="ctl00$ContentPlaceHolder1$ctl01$CheckboxChoices0-842352753" onclick="javascript:setTimeout(&#39;__doPostBack(\&#39;ctl00$ContentPlaceHolder1$ctl01$CheckboxChoices0-842352753\&#39;,\&#39;\&#39;)&#39;, 0)" /></span><label for="ctl00_ContentPlaceHolder1_ctl01_CheckboxChoices0-842352753">1</label></li></ul>
            </div>
        </div>
    </div>
</div>

我的问题是，响应中前几个字符的含义是什么，即 1 |＃|| 4 | 。这是某种代币吗？