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131 lines
4.1 KiB
Markdown
131 lines
4.1 KiB
Markdown
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# [Chinese](../zh-cn/plugins/limit-req.md)
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# Summary
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- [**Name**](#name)
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- [**Attributes**](#attributes)
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- [**How To Enable**](#how-to-enable)
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- [**Test Plugin**](#test-plugin)
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- [**Disable Plugin**](#disable-plugin)
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## Name
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limit request rate using the "leaky bucket" method.
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## Attributes
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|Name |Requirement |Description|
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|--------- |--------|-----------|
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|rate |required|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 |required|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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| key |required|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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|rejected_code |optional|The HTTP status code returned when the request exceeds the threshold is rejected. The default is 503.|
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**Key can be customized by the user, only need to modify a line of code of the plug-in to complete. It is a security consideration that is not open in the plugin.**
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## How To Enable
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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 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -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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You can open dashboard with a browser: `http://127.0.0.1:9080/apisix/dashboard/`, to complete the above operation through the web interface, first add a route:
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Then add limit-req plugin:
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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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```html
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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 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -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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