SharePoint 2013: UserAgent not available, file operations may not be optimized

I encountered this problem after creating a new document library 'App'. After a little searching, I found the following code to flush the BLOB cache  to resolve the problem.

$webApp = Get-SPWebApplication "http://ihaveablobproblem.com"
[Microsoft.SharePoint.Publishing.PublishingCache]::FlushBlobCache($webApp)

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