问题
We have a Sitecore/Webforms based website that we'd like to run behind Akamai CDN however we're having an issue with ViewState MAC validation on our postbacks.
We've worked around this for most of the core forms on the site (by taking them out of the CDN cache and serving them direct for every user), but we're left with a simple form in the footer of every page that posts back to the server.
Currently we're seeing errors:
Validation of viewstate MAC failed.
I believe this is caused by the CDN caching the viewstate fields from the original request and these (obviously) not matching for other users.
As we are running this site on multiple servers, we already have the machinekey correctly configured (we've been able to use postBackUrl settings to post back to other pages/SSL instances/etc.) before we added Akamai.
As we're running Asp.NET 4.5.2 there's no way we can even attempt to disable viewstate MAC even if we thought it was a good idea.
Setting ViewStateMode=Disabled still leaves us with a tiny viewstate (presumably the MAC) which still causes problems.
Is there anyway we can remove the session dependence from the viewstate?
The basic steps we can use to replicate this:
- Request page from Browser A - Akamai caches page.
- Submit form from Browser A - Success!
- Request page from Browser B - Akamai serves cached page.
- Submit form from Browser B - ERROR!
回答1:
Nope, Akamai CDN never caches POST requests. But its good idea to try adding the forms to do not cache list and try replicate the issue.
来源：https://stackoverflow.com/questions/29922193/using-postbacks-with-a-cdn