I want to do the following. If a user comes to a special site collection he will be redirected to a subsite. If the subsite doesn't exist it will be created.
I know that's a creation in a GETRequest and I already tested everything from AllowUnsafeUpdates to ValidateFormDigest but nothing will create the site for me. I should be something like the MySiteHost.
Do you have an idea how doing this?