doc error about traffic mirror

[huangmu1987]

What happened:

while using mirror feature to foward traffic to another backend as document of
https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#mirror

this example will lead to a mistake of adding an extra "/" between domain name and uri
nginx.ingress.kubernetes.io/mirror-target: https://test.env.com/$request_uri

should be https://test.env.com$request_uri

[longwuyuan]

I am testing this and I am finding at least one problem. The subrequest upstream hostname changes to the resolved ipaddress of the upstream(mirror).

And I get the request going to the upstream and don't have trace or proper tcpdump configured to know the request URL received by the mirror.

Can you share screen on meet.jit.si and show your test environment where you discoverd this documentation fault.

[longwuyuan]

But i see the directive set as

And this page https://nginx.org/en/docs/http/ngx_http_mirror_module.html

is proof that what you reported is a genuine documentation bug. Hoping to remove that '/ asap.

Thanks for reporting this

/triage accepted

[longwuyuan]

/kind documentation
/area docs