ethercalc_ynh/conf/nginx.conf

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

  proxy_pass        http://127.0.0.1:__PORT__/;
  proxy_redirect    off;
  proxy_set_header  Host $host;
  proxy_set_header  X-Real-IP $remote_addr;
  proxy_set_header  X-Forwarded-Proto $scheme;
  proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header  X-Forwarded-Host $server_name;

  proxy_http_version 1.1;
  proxy_set_header Connection "upgrade";
  proxy_set_header Upgrade $http_upgrade;

  # Include SSOWAT user panel.
  include conf.d/yunohost_panel.conf.inc;
  more_clear_input_headers 'Accept-Encoding';
}