下列情况是从浏览器的地址栏正常取得Request.ServerVariables("HTTP_REFERER")的:
1.直接用<a href>
2.用Submit或<input type=image>提交的表单(POSTorGET)
3.使用Jscript提交的表单(POSTorGET)
下面我们再看看Request.ServerVariables("HTTP_REFERER")不能正常取值的情况:
1.从收藏夹链接
2.单击'主页'或者自定义的地址
3.利用Jscript的location.hreforlocation.replace()
4.在浏览器直接输入地址
5.<%Response.Redirect%>
6.<%Response.AddHeader%>或<meta http-equiv=refresh>转向
7.用XML加载地址
显然,Request.ServerVariables("HTTP_REFERER")在多数情况下是不能正常工作的,下面我们看一个例子:
ref.asp
<%
response.write "You came from: " & request.servervariables("http_referer")
%>
ref.htm
<%
Response.AddHeader "Refresh", "10;URL=ref.asp"
%>
<meta http-equiv='refresh' content='10;URL=ref.asp'>
<form method=GET action=ref.asp name=getform>
<input type=submit value=' Go there (GET) >>'>
<input type=image style='cursor:hand'>
</form><p>
看看上面的代码会得到什么的结果.
<form method=POST action=ref.asp name=postform>
<input type=submit value=' Go there (POST) >>'>
<input type=image style='cursor:hand'>
</form><p>
<a href='ref.asp'>直接链接<p>
<a href='#' onclick='window.location.href="ref.asp";return false;'>Javascriptlocation<p>
<a href='#'onclick='window.location.replace("ref.asp");return false;'>Javascriptreplace<p>
<a href='#' onclick='document.getform.submit();return false;'>javascriptGET<p>
<a href='#' onclick='document.postform.submit();return false;'>javascriptPOST
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