user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    limit_req_zone $remote_addr zone=req_zone:10m rate=1r/s;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
}

server {
    listen       80;
    server_name  localhost;

    #charset koi8-r;
    #access_log  /var/log/nginx/host.access.log  main;
    
    location /message {
        default_type    application/json;
        limit_req zone=req_zone nodelay;
        return 200 '{"status":200,"msg":"服务正在升级，请稍后再试……","ip":$remote_addr}';
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

}

配置如上，访问/message时一秒内可以多次访问，并没有限速成功，是什么原因？