Allow access of files cached in the IIS Blob Cache to also make it to the audit database
In SP2013 you cannot successfully audit files that are being cached in the IIS blob cache. I'm hoping that this will be improved in SP2016. The use of IIS blob caching for certain file types (in our case .mp4) interferes with auditing in SharePoint 2013. If the users GET a file that will be cached in the IIS blob cache, only the first request for that file will be recorded in the audit database. If there are four web front ends, auditing will show four requests. All subsequent requests for that file will not be audited while the file is in the cache. I opened a support case with Microsoft Support and the SharePoint Product Group was notified. They say this behavior is by design and they’re not likely to fix it for SP2013. But they said they *might* redesign it for SharePoint 2016 OnPrem/Online.