synapse-admin_ynh/conf/endpoint.nginx.conf

location /_synapse/admin {

    proxy_pass http://127.0.0.1:__SYNAPSE_PORT__;
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $host;

    client_max_body_size 100M;

    proxy_http_version 1.1;

    more_set_headers "Access-Control-Allow-Origin: https://__DOMAIN__";
}