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Use the VaryByHeader to create new cached versions of a page in case of new browser header changes.
Several standard browser headers are transmitted with each page request, including
Accept-Language: a list of languages.
User-Agent: type of device making the request.
Cookie: the browser cookies created in the current domain.
<%@ Page Language="C#" %>
<%@ OutputCache Duration="3600" VaryByParam="none" VaryByHeader="User-Agent" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Vary By Header</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<%= DateTime.Now.ToString("T") %>
<hr />
<%= Request.UserAgent %>
</div>
</form>
</body>
</html>
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