Upgrade a site from SharePoint 2007 and try to visit the List Throttling page from Central admin and saw the error
Updates are currently disallowed on GET requests. To allow updates on a GET, set the ‘AllowUnsafeUpdates’ property on SPWeb.”
Found a piece of powershell script from link below.
According to “DanRoot”
$w = get-spwebapplication http://nameofproblemwebapp
The call to HttpThrottleSettings apparently ensures they exist, and Update() saves them. After doing this, we were able to get to settings on the problem web apps.
It worked for me.