Reverse proxy for a TP-LINK router returns 403

Hi Folks,

I'm tring to "secure" my home network using reverse proxy to "transform" http requests from ip-cams and routers to https...

I've already routed http requests for ip-cam to https using: https://my-ip-address/ip-cam/

location /ip_cam/ {
proxy_pass http://x.y.w.v:z/;
proxy_redirect off;
proxy_set_header Host $host:$server_port;
proxy_set_header X-Real-IP $remote_addr;
}

Noa, I wish to do the same with my AP (an Archer C20i from TP-LINK) but, after initial login screen, instead of page showed by "ok.png", I receive only a page with 403 Frames (as per attached Screenshot ...)...

Any idea?

thanks in advance for any help,
m.