mirror of
https://gitee.com/iresty/apisix.git
synced 2024-12-14 17:01:20 +08:00
86 lines
2.3 KiB
Markdown
86 lines
2.3 KiB
Markdown
# limit-count
|
|
[中文](limit-count-cn.md)
|
|
|
|
limit request rate using the "leaky bucket" method.
|
|
|
|
### Parameters
|
|
* `rate`: is the specified request rate (number per second) threshold.Requests exceeding this rate (and below `burst`) will get delayed to conform to the rate.
|
|
* `burst`: is the number of excessive requests per second allowed to be delayed. Requests exceeding this hard limit will get rejected immediately.
|
|
* `rejected_code`: The HTTP status code returned when the request exceeds the threshold is rejected. The default is 503.
|
|
* `key`: is the user specified key to limit the rate, now only accept "remote_addr"(client's IP) as key
|
|
|
|
### example
|
|
|
|
#### enable plugin
|
|
Here's an example, enable the limit req plugin on the specified route:
|
|
|
|
```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
|
|
}
|
|
}
|
|
}'
|
|
```
|
|
|
|
#### test plugin
|
|
The above configuration limits the request rate to 1 per second. If it is greater than 1 and less than 3, the delay will be added. If the rate exceeds 3, it will be rejected:
|
|
```shell
|
|
curl -i http://127.0.0.1:9080/index.html
|
|
```
|
|
|
|
When you exceed, you will receive a response header with a 503 return code:
|
|
```
|
|
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>
|
|
```
|
|
|
|
This means that the limit req plugin is in effect.
|
|
|
|
#### disable plugin
|
|
When you want to disable the limit req plugin, it is very simple,
|
|
you can delete the corresponding json configuration in the plugin configuration,
|
|
no need to restart the service, it will take effect immediately:
|
|
```shell
|
|
curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
|
|
{
|
|
"methods": ["GET"],
|
|
"uri": "/index.html",
|
|
"id": 1,
|
|
"plugins": {
|
|
},
|
|
"upstream": {
|
|
"type": "roundrobin",
|
|
"nodes": {
|
|
"39.97.63.215:80": 1
|
|
}
|
|
}
|
|
}'
|
|
```
|
|
|
|
The limit req plugin has been disabled now. It works for other plugins.
|