Putting a WAF in front of an application used to be a simple decision. Buy an appliance, load a signature set, place it at the perimeter, and call the problem solved. That model still exists, but it no longer matches how applications are built or how they are attacked. A traditional standalone WAF is now widely treated as obsolete as a primary security control — not because rule matching stopped working, but because the perimeter it was designed for has largely disappeared.
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