Rewrite / transform response header values?

I've revised my question. What I would really like to do is rewrite / transform the value of any response header.

Is there a way to do that with Traefik?

Just noticed this in the docs...


...which explains why I couldn't set multiple cookies using customResponseHeaders.


I can't find a way to set cookies in the response. Anyone know of a way?

My immediate need is simply to set the domain for cookies in the response, which seems pretty straightforward to do in nginx via the proxy_cookie_domain directive of the ngx_http_proxy_module module.

Is there a way to achieve the same result with Traefik?