本文主要解析一下ngx_http_core_module、ngx_http_limit_conn_module以及ngx_http_limit_req_module中的limit相关配置参数。

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limit_rate

名称	默认配置	作用域	官方说明	中文解读	模块
limit_rate	limit_rate 0;	http, server, location, if in location	Limits the rate of response transmission to a client. The rate is specified in bytes per second. The zero value disables rate limiting. The limit is set per a request, and so if a client simultaneously opens two connections, the overall rate will be twice as much as the specified limit.	指定每秒该连接能下载的bytes,主要用来限制个别请求的带宽	ngx_http_core_module
limit_rate_after	limit_rate_after 0;	http, server, location, if in location	Sets the initial amount after which the further transmission of a response to a client will be rate limited.	设置多少bytes过后将启动limit计数,如果小于此值则不限速	ngx_http_core_module
limit_except	没有默认值	location	Limits allowed HTTP methods inside a location. The method parameter can be one of the following: GET, HEAD, POST, PUT, DELETE, MKCOL, COPY, MOVE, OPTIONS, PROPFIND, PROPPATCH, LOCK, UNLOCK, or PATCH. Allowing the GET method makes the HEAD method also allowed	设置除了指定的http methods外其他method将被限制，允许GET就自动允许HEAD方法	ngx_http_core_module

实例

 location /downloads {
      limit_rate_after 1m;
      limit_rate 500k;
    }

    location / {
      proxy_pass http://localhost:3000;
      limit_except GET {
        deny all;
      }
    }

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