2019-06-06 10:57:40 +08:00
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# limit-count
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[English](limit-count.md)
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和 [GitHub API 的限速](https://developer.github.com/v3/#rate-limiting)类似，
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在指定的时间范围内，限制总的请求个数。并且在 HTTP 响应头中返回剩余可以请求的个数。
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### 参数
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* `count`：指定时间窗口内的请求数量阈值
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* `time_window`：时间窗口的大小（以秒为单位），超过这个时间就会重置
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* `rejected_code`：当请求超过阈值被拒绝时，返回的 HTTP 状态码，默认是 503
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* `key`：是用来做请求计数的依据，当前只接受终端 IP 做为 key，即 "remote_addr"
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### 示例
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#### 开启插件
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下面是一个示例，在指定的 route 上开启了 limit count 插件:
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```shell
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2019-06-17 18:00:56 +08:00
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curl -i http://127.0.0.1:9080/apisix/admin/routes/1 -X POST -d '
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2019-06-06 10:57:40 +08:00
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{
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2019-06-18 09:40:00 +08:00
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"uri": "/index.html",
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"plugins": {
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"limit-count": {
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"count": 2,
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"time_window": 60,
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"rejected_code": 503,
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"key": "remote_addr"
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}
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},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"39.97.63.215:80": 1
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}
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}
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2019-06-06 10:57:40 +08:00
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}'
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```
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#### 测试插件
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上述配置限制了 60 秒内只能访问 2 次，前两次访问都会正常访问：
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```shell
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curl -i http://127.0.0.1:9080/index.html
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```
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响应头里面包含了 `X-RateLimit-Limit` 和 `X-RateLimit-Remaining`，他们的含义分别是限制的总请求数和剩余还可以发送的请求数：
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```
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HTTP/1.1 200 OK
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Content-Type: text/html
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Content-Length: 13175
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Connection: keep-alive
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X-RateLimit-Limit: 2
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X-RateLimit-Remaining: 0
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Server: APISIX web server
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```
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当你第三次访问的时候，就会收到包含 503 返回码的响应头：
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```
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HTTP/1.1 503 Service Temporarily Unavailable
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Content-Type: text/html
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Content-Length: 194
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Connection: keep-alive
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Server: APISIX web server
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<html>
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<head><title>503 Service Temporarily Unavailable</title></head>
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<body>
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<center><h1>503 Service Temporarily Unavailable</h1></center>
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<hr><center>openresty</center>
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</body>
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</html>
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```
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这就表示 limit count 插件生效了。
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#### 移除插件
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当你想去掉 limit count 插件的时候，很简单，在插件的配置中把对应的 json 配置删除即可，无须重启服务，即刻生效：
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```shell
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2019-06-18 09:40:00 +08:00
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
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2019-06-06 10:57:40 +08:00
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{
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2019-06-18 09:40:00 +08:00
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"methods": ["GET"],
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"uri": "/index.html",
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"39.97.63.215:80": 1
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}
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}
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2019-06-06 10:57:40 +08:00
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}'
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```
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现在就已经移除了 limit count 插件了。其他插件的开启和移除也是同样的方法。
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