Expire Output Cache ASP.Net MVC

Question

I am using the standard outputcache tag in my MVC app which works great but I need to force it to be dumped at certain times. How do I achieve this? The page that gets cac

Answer 1

Be careful about using "None" vs. "".

• If you send "" then the HttpHeader for Vary is not sent.
• If you send "None" then the HttpHeader for Vary is sent.

I used Fiddler to verify this behavior.

This seems to have an impact on whether or not the browser goes back to the server to check for latest version (causing a 304). At least in Chrome it does. You want to use Varies="" if you know for sure you aren't going to want to update the file before it has expired.

I'd recommend using Varies="" as I did in this post. For my javascript file I dont want the browser going back and making another Http request until it has expired. 304 is unnecessary.