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In ASP.NET MVC or ASP.NET Web Form, when using OutputCacheAttribute or OutputCache tag, the Location property is not work,any value,for example "Downstream", the ASP.NET will cache response still,and cached response the content-type is fixed is text/html,
<%@ Page Language="C#" %>
<%@ OutputCache Duration="1200" Location="Downstream" VaryByParam="*" VaryByControl="*" %>
protected override void OnLoad(EventArgs e)
Response.ContentType = "json";
the response DateTime.Now.Ticks is fixed.
When I using :
Response.AppendHeader("Cache-Control", "public, max-age=1200");
It's work, ASP.NET is don't cache .