OutputCache is sending wrong Vary header when the call hits the cache

Question

I have an action method that I want to cache:

[OutputCache(Duration=60*5, Location=OutputCacheLocation.Any, VaryByCustom=\"index\")]
public ActionResult Index()
         


        

Answer 1

I am using a custom cache provider and in this case there is a simple solution for this. On the BeginRequest, based on the user authentication status, we set a context information to not run cache:

HttpContext.Current.Items["NoCache"] = "1";

And then on our GetVaryBy method we return null if this information is set:

public override string GetVaryByCustomString(HttpContext context, string custom)
{
    if (HttpContext.Current.Items["NoCache"] != null)
        return null;

    // remaining code here
}

And then on the cache methods, we can test the same. For instance:

public override object Add(string key, object entry, DateTime utcExpiry)
{
    if (HttpContext.Current.Items["NoCache"] != null)
        return null;

    // remaining code here
}