Maxim, hello.

On 26 Apr 2020, at 17:28, Maxim Dounin wrote:

> Relevant ticket is here:
>
> https://trac.nginx.org/nginx/ticket/564
>
> Unfortunately, there is no obvious solution. On the other hand,
> this is something relatively easy to work around.

Aha, so it _is_ the map regexp and the rewrite regexp mutually
interfering! Thanks for the speedy insight.

Looking through the comments in the ticket, I agree with you that 'the
current behaviour is bad, and should be fixed'. If only on a principle
of least surprise.

Until it is fixed, however, it would be extremely useful if, in the
description of the 'map' stanza (ie, in
https://nginx.org/en/docs/http/ngx_http_map_module.html) it mentioned
that the regexp in 'map' can interfere with the regexp in a 'rewrite'
directive, in such a way that positional groups in the latter don't
work. It could note that this is a (temporary?) defect, but that until
it is fixed, using named groups in the 'rewrite' regexp is a good
workaround, and give an example.

It would be better here than in the documentation of 'rewrite', as that
would keep the 'rewrite' documentation relatively simple. It only needs
to be seen by people using 'rewrite' and 'map' together, who might be
assumed to be marginally more sophisticated users.

Best wishes,

Norman


--
Norman Gray : https://nxg.me.uk
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