Add below attribute on controller's method.
[OutputCache(VaryByParam = "None", VaryByCustom = "Host", Duration = 14400)]
public ActionResult Index(string category)
Add below method in gobal.asax file
public override string GetVaryByCustomString(HttpContext context, string custom)
{
if (custom == "Host")
{
string sCategory = "";
if (!string.IsNullOrEmpty(HttpUtility.ParseQueryString(context.Request.Url.ToString()).Get("CategoryName")))
{
sCategory = HttpUtility.ParseQueryString(context.Request.Url.ToString()).Get("CategoryName");
}
return context.Request.Url.Host + context.Request.Url.Port + sCategory ;
}
return String.Empty;
}