further re DrHyde's offering: Tho he did not make it explicit, his approach offers a good first step for protecting yourself against embedded malware.
Obvious? Maybe. Maybe that's already why you're checking the input. Or maybe the http: response is coming from a machine you control and thus, trust.
But unless you're rilly, rilly POSITIVE! the incoming data is always going to be clean, you really do want to consider the obvious... very early in the game.
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