Equivalent to after_request that works for 404s &c?

[gray notch]

I have code filling out some local headers using after_request for the root router. This works fine, except when a request is determined not to have any usable handler at all.

What should I be using instead?

[torpid fox]

Notes for Equivalent to after_request that works for 404s &c?

At your assistance

@gray notch

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