registry/contrib/compose/nginx/docker-registry.conf

proxy_pass                       http://docker-registry;
proxy_set_header  Host           $http_host;   # required for docker client's sake
proxy_set_header  X-Real-IP      $remote_addr; # pass on real client's IP
proxy_set_header  Authorization  ""; # see https://github.com/docker/docker-registry/issues/170
proxy_read_timeout               900;