https和http 调用过程中请求头 referrer 获取不到的问题

HTTP协议规定：

Clients SHOULD NOT include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.

解决办法：

1、表单添加一个字段referrer，如果头部没有Referer，则获取表单的这个字段，

     添加js：

<input id="referrer" type="hidden" name="referrer" />
 <script type="text/javascript">
		document.getElementById("referrer").value =  window.location.href
 </script>

2、后台：

 string urlReferrer = "";
 if (Request.UrlReferrer == null)
 {
     urlReferrer = Request["referrer"];
 }
 else
 {
     urlReferrer = Request.UrlReferrer.AbsoluteUri;
 }

来自为知笔记(Wiz)