AllowUnsafeUpdates
is set to true when you are trying to update the database as a result of the GET request.
Say you have a list and you want to update something, then you need to set
AllowUnsafeUpdates = true
for the web and after you have done you need to set it back to false.
So it is not relevant to use
AllowUnsafeUpdates
option when updating nothing in web.
Read full article here :
Why do I need to use AllowUnsafeUpdates?
Hope this helps!