rails favicon issues, negative route constraints -

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when visit domain.com/favicon.ico 404's, localhost:3000/favicon.ico renders favicon successfully.

i think it's catching on root parameter route because layout rendered differently generic 404 page when tried fake route /aliwejfl/aliwejf. 

get '/:nickname' => 'users#profile'

i know can whitelist mime types in route constraints:

constraints(format: 'html')   # routes here end

but there way blacklist?

figured out when writing question. forgot regular expressions allowed.

constraints(format: /(?!ico)/)   # routes end

that way get /not_favicon.ico 404.


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