New answers tagged nonce
Why are you using the edit.php page for this export link? The edit.php code appears to be checking on the "bulk-posts" nonce, which is probably where your failure is, since you're not using that nonce. You should probably be using post.php instead, or a more general hook with your action.
Nonces are used to verify that a request is allowed from the sender. For public data, all GET requests are allowed, if they match existing public content. So no, do not use a nonce for that. You have nothing to do if the nonce validation fails. That’s always a good indicator for unnecessary information.
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