Catching 404

Hello,
 is it possible to catch a 404 with ocamlnet ?
Use case example : if the page doesn't exists then, it give a way to
create/edit the unknown page.
It seems, I would have to rewrite is_error_response according to
http://projects.camlcity.org/projects/dl/ocamlnet-3.2.1/doc/html-main/Http_fs.html#VALis_error_response
Is it the case ?

In the same way, is it possible to configure url rewriting with ocamlnet ?

Regards,

Pierre-Alexandre

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