etherpad_ynh/conf/nginx.conf

#sub_path_only rewrite ^__PATH__$ __PATH__/ permanent;
location __PATH__/ {

    proxy_pass         http://127.0.0.1:__PORT__/;
    proxy_set_header   Host $host;
    proxy_pass_header  Server;

    proxy_buffering off;
    more_set_headers "X-Frame-Options : ALLOWALL";
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $host;
    proxy_http_version 1.1;
  
    # WebSocket proxying - from http://nginx.org/en/docs/http/websocket.html
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;

    client_max_body_size 50M;

    # Include SSOWAT user panel.
    include conf.d/yunohost_panel.conf.inc;
}

location ~* __PATH__/p/[^/]*(_|%|\*)[^/]*/export/etherpad {
    return 404;
}