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86 lines
2.5 KiB
Markdown
86 lines
2.5 KiB
Markdown
[中文](limit-req-cn.md)
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# limit-req
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limit request rate using the "leaky bucket" method.
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### Parameters
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* `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.
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* `burst`: is the number of excessive requests per second allowed to be delayed. Requests exceeding this hard limit will get rejected immediately.
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* `rejected_code`: The HTTP status code returned when the request exceeds the threshold is rejected. The default is 503.
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* `key`: is the user specified key to limit the rate, now accept those as key: "remote_addr"(client's IP), "server_addr"(server's IP), "X-Forwarded-For/X-Real-IP" in request header.
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### example
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#### enable plugin
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Here's an example, enable the limit req plugin on the specified route:
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
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{
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"methods": ["GET"],
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"uri": "/index.html",
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"plugins": {
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"limit-req": {
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"rate": 1,
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"burst": 2,
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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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}'
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```
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#### test plugin
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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:
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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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When you exceed, you will receive a response header with a 503 return code:
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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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This means that the limit req plugin is in effect.
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#### disable plugin
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When you want to disable the limit req plugin, it is very simple,
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you can delete the corresponding json configuration in the plugin configuration,
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no need to restart the service, it will take effect immediately:
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
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{
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"methods": ["GET"],
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"uri": "/index.html",
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"id": 1,
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"plugins": {
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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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}'
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```
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The limit req plugin has been disabled now. It works for other plugins.
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