apisix/doc/plugins/limit-req-cn.md

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[English](limit-req.md)
# limit-req
限制请求速度的插件,使用的是漏桶算法。
### 参数
* `rate`:指定的请求速率(以秒为单位),请求速率超过 `rate` 但没有超过 `rate` + `brust`)的请求会被加上延时
* `burst`:请求速率超过 `rate` + `brust`)的请求会被直接拒绝
* `rejected_code`:当请求超过阈值被拒绝时,返回的 HTTP 状态码
* `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"
### 示例
#### 开启插件
下面是一个示例,在指定的 route 上开启了 limit req 插件:
```shell
curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
{
"methods": ["GET"],
"uri": "/index.html",
"plugins": {
"limit-req": {
"rate": 1,
"burst": 2,
"rejected_code": 503,
"key": "remote_addr"
}
},
"upstream": {
"type": "roundrobin",
"nodes": {
"39.97.63.215:80": 1
}
}
}'
```
#### 测试插件
上述配置限制了每秒请求速率为 1大于 1 小于 3 的会被加上延时,速率超过 3 就会被拒绝:
```shell
curl -i http://127.0.0.1:9080/index.html
```
当你超过,就会收到包含 503 返回码的响应头:
```
HTTP/1.1 503 Service Temporarily Unavailable
Content-Type: text/html
Content-Length: 194
Connection: keep-alive
Server: APISIX web server
<html>
<head><title>503 Service Temporarily Unavailable</title></head>
<body>
<center><h1>503 Service Temporarily Unavailable</h1></center>
<hr><center>openresty</center>
</body>
</html>
```
这就表示 limit req 插件生效了。
#### 移除插件
当你想去掉 limit req 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:
```shell
curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
{
"methods": ["GET"],
"uri": "/index.html",
"upstream": {
"type": "roundrobin",
"nodes": {
"39.97.63.215:80": 1
}
}
}'
```
现在就已经移除了 limit req 插件了。其他插件的开启和移除也是同样的方法。